The Akkadian Empire (/əˈkeɪdiən/) was the first known ancient empire of Mesopotamia, succeeding the long-lived civilization of Sumer. Centered on the city of Akkad (/ˈækæd/) and its surrounding region, the empire united Akkadian and Sumerian speakers under one rule and exercised significant influence across Mesopotamia, the Levant, and Anatolia, sending military expeditions as far south as Dilmun and Magan (modern United Arab Emirates, Saudi Arabia, Bahrain, Qatar and Oman) in the Arabian Peninsula.

The Akkadian Empire reached its political peak between the 24th and 22nd centuries BC, following the conquests by its founder Sargon of Akkad. Under Sargon and his successors, the Akkadian language was briefly imposed on neighboring conquered states such as Elam and Gutium. Akkad is sometimes regarded as the first empire in history, though the meaning of this term is not precise, and there are earlier Sumerian claimants.

Epigraphic sources from the Sargonic (Akkadian Empire) period are in relatively short supply, partly because the capital Akkad, like the capitals of the later Mitanni and Sealand, has not yet been located, though there has been much speculation. Some cuneiform tablets have been excavated at cities under Akkadian Empire control such as Eshnunna and Tell Agrab.

Other tablets have become available on the antiquities market and are held in museums and private collections such as those from the Akkadian governor in Adab. Internal evidence allows their dating to the Sargonic period and sometimes to the original location. Archives are especially important to historians and only a few have become available. The Me-sag Archive, which commenced publication in 1958, is considered one of the most significant collections. The tablets, about 500 in number with about half published, are held primarily at the Babylonian Collection of the Yale University and Baghdad Museum with a few others scattered about. The tablets date to the period of late in the reign of Naram-Sin to early in the reign of Shar-kali-shari. They are believed to be from a town between Umma and Lagash and Me-sag to be the governor of Umma. An archive of 47 tablets was found at the excavation of Tell el-Suleimah in the Hamrin Basin.

Various royal inscriptions by the Akkadian rulers have also been found. Most of the original examples are short, or very fragmentary like the Victory Stele of Naram-Sin and the Sargonic victory stele from Telloh. A few longer ones are known because of later copies made, often from the much later Old Babylonian period. While these are assumed to be mostly accurate, it is difficult to know if they had been edited to reflect current political conditions. One of the longer surviving examples is the Bassetki Statue, the copper base of a Narim-Sin statue:

"Naram-Sin, the mighty, king of Agade, when the four quarters together revolted against him, through the love which the goddess Astar showed him, he was victorious in nine battles in one in 1 year, and the kings whom they (the rebels[?]) had raised (against him), he captured. In view of the fact that he protected the foundations of his city from danger, (the citizens of his city requested from Astar in Eanna, Enlil in Nippur, Dagan in Tuttul, Ninhursag in Kes, Ea in Eridu, Sin in Ur, Samas in Sippar, (and) Nergal in Kutha, that (Naram-Sin) be (made) the god of their city, and they built within Agade a temple (dedicated) to him. As for the one who removes this inscription, may the gods Samas, Astar, Nergal, the bailiff of the king, namely all those gods (mentioned above) tear out his foundations and destroy his progeny."

A number of fragments of royal statues of Manishtushu all bearing portions of a "standard inscription". Aside from a few minor short inscriptions this is the only known contemporary source for this ruler. An excerpt:

"Man-istusu, king of the world: when he conquered Ansan and Sirihum, had ... ships cross the Lower Sea. The cities across the Sea, thirty-two (in number), assembled for battle, but he was victorious (over them). Further, he conquered their cities, [st]ru[c]k down their rulers and aft[er] he [roused them (his troops)], plundered as far as the Silver Mines. He quarried the black stone of the mountains across the Lower Sea, loaded (it) on ships, and moored (the ships) at the quay of Agade"

Before the Akkadian Empire, calendar years were marked by Regnal Numbers. During Sargonic times, a system of year-names was used. This practice continued until the end of the Old Babylonian period, for example, "Year in which the divine Hammu[rabi] the king Esznunna destroyed by a flood.” Afterwards, Regnal Numbers were used by all succeeding kingdoms. During the Akkadian Empire 3 of the presumed 40 Sargon year-names are known, 1 (presumed 9) of Rimush, 20 (presumed 56) of Naram-Sin, and 18 (presumed 18) of Shar-kali-shari. Recently, a single year-name had been found "In the year that Dūr-Maništusu was established.” There are also, perhaps, a dozen more known, which cannot be firmly linked to a ruler. Especially with the paucity of other inscriptions, year-names are extremely important in determining the history of the Akkadian Empire. As an example, from one year-name, we know that the empire was in conflict with the Gutians long before its end. It attests the name of a Gutian ruler and marks the construction of two temples in Babylon as recognition of Akkadian victory.

"In the year in which Szarkaliszarri laid the foundations of the temples of the goddess Annunitum and of the god Aba in Babylon and when he defeated Szarlak, king of Gutium"

The final contemporary source are seals and their sealing dates. These are especially important here, as markers, with the shortage of other Akkadian Empire epigraphics and very useful to historians. As an example, two seals and one sealing were found in the Royal Cemetery at Ur which contained the name of Sargons's daughter En-hedu-ana. This provided confirmation of her existence. The seals read "En-hedu-ana, daughter of Sargon: Ilum-pal[il] (is) her coiffeur" and "Adda, estate supervisor/majordomo of En-hedu-ana". At Tell Mozan (ancient Urkesh) brought to light a clay sealing of Tar'am-Agade (Akkad loves <her>), a previously unknown daughter of Naram-Sin, who was possibly married to an unidentified local endan (ruler).

So great was the Akkadian Empire, especially Sargon and Narim-Sin, that its history was passed down for millennia. This ranged on one end to purported copies of still existing Sargonic period inscriptions to literary tales made up from the whole cloth at the other. A few examples:

• Great Rebellion Against Naram-Sin – At one point in his reign much of the Empire, especially in the old mainly Sumerian city-states, rose up against Naram-Sin. The revolt was crushed but the echoes of the event were passed down in history. Some of the tales, like "Naram-Sin and the Enemy Hordes" (Old Babylonian – purported to be a copy of an inscription at the temple of Nergal in Cutha) and "Gula-AN and the Seventeen Kings against Naram-Sin" were literary compositions which further developed and changed the themes. The earliest examplar, from the Old Babylonian period, is found in several incomplete tablets and fragments, which differ somewhat, purporting to be copies of an inscription on a statue of Naram-Sin standing in the Ekur temple of Enlil at Nippur. Because it aligns with known contemporary inscriptions and year name it is considered authentic, which the usual Mesopotamian slant that something going wrong means you displeased the gods.

"... By the verdict of the goddess Astar-Annunltum, Naram-Sin, the mighty, [was vic]torious over the Kisite in battle at TiWA. [Further], Ili-resi, the general; Ilum-muda, Ibbi-Zababa, Imtalik, (and) Puzur-Asar, captains of Kis; and Puzur-Ningal, governor of TiWA; Ili-re'a, his captain; Kullizum, captain of Eres; Edam'u, captain of Kutha ..."

• Cursing of Agade – A purely literary composition which was handed down for millennia in Mesopotamia. Composed in the Ur III period, a century or at most two after the events, it is essentially artistic propaganda. After a long period of Akkadian dominance the Sumerians from the south are back in ascendancy. The Ur rule is sometimes called the Neo-Sumerian Empire. This composition lays all the troubles before the rise of Ur at the feet of the Akkadian Empire (because Naram-Sin leveled the Ekur temple of Enlil while rebuilding it causing the eight chief deities of Mesopotamia to withdraw their support and protection from Akkad). While basically fiction, it is still useful to historians.

"...Enlil brought out of the mountains those who do not resemble other people, who are not reckoned as part of the Land, the Gutians, an unbridled people, with human intelligence but canine instincts and monkeys' features. Like small birds they swooped on the ground in great flocks. Because of Enlil, they stretched their arms out across the plain like a net for animals. Nothing escaped their clutches, no one left their grasp. Messengers no longer traveled the highways, the courier's boat no longer passed along the rivers. The Gutians drove the trusty (?) goats of Enlil out of their folds and compelled their herdsmen to follow them, they drove the cows out of their pens and compelled their cowherds to follow them. Prisoners manned the watch. Brigands occupied the highways. The doors of the city gates of the Land lay dislodged in mud, and all the foreign lands uttered bitter cries from the walls of their cities ..."

There were a number of these, passed down as part of scribel tradition including The Birth Legend of Sargon (Neo-Assyrian), Weidner Chronicle, and the Geographical Treatise on Sargon of Akkad's Empire.

Identifying architectural remains is hindered by the fact that there are sometimes no clear distinctions between features thought to stem from the preceding Early Dynastic period, and those thought to be Akkadian. Likewise, material that is thought to be Akkadian continues to be in use into the Ur III period. There is a similar issue with cuneiform tablets. In the early Akkadian Empire tablets and the signs on them are much like those from earlier periods, before developing into the much different Classical Sargonic style.

With the capital, Akkad, still unlocated, archaeological remains of the empire are still to be found, mainly at the cities where they established regional governors. An example is Adab where Naram-Sin established direct imperial control after Adab joined the "great revolt". After destroying the city of Mari the Akkadian Empire rebuilt it as an administrative center with an imperial governor. The city of Nuzi was established by the Akkadians and a number of economic and administrative texts were found there. Similarly, there are Marad, Nippur, Tutub and Ebla.

Excavation at the modern site of Tell Brak has suggested that the Akkadians rebuilt a city ("Brak" or "Nagar") on this site, for use as an administrative center. The city included two large buildings including a complex with temple, offices, courtyard, and large ovens.

The Akkadian period is generally dated to 2334–2154 BC (according to the middle chronology). The short-chronology dates of 2270–2083 BC are now considered less likely. It was preceded by the Early Dynastic Period of Mesopotamia (ED) and succeeded by the Ur III Period, although both transitions are blurry. For example, it is likely that the rise of Sargon of Akkad coincided with the late ED Period and that the final Akkadian kings ruled simultaneously with the Gutian kings alongside rulers at the city-states of both Uruk and Lagash. The Akkadian Period is contemporary with EB IV (in Israel), EB IVA and EJ IV (in Syria), and EB IIIB (in Turkey).

The relative order of Akkadian kings is clear, while noting that the Ur III version of the Sumerian King List inverts the order of Rimush and Manishtushu. The absolute dates of their reigns are approximate (as with all dates prior to the Late Bronze Age collapse c. 1200 BC).

Ruler		Middle chronology All dates BC	Family tree
Sargon		2334–2279
Rimush		2278–2270
Manishtushu		2269–2255
Naram-Sin		2254–2218
Shar-Kali-Sharri		2217–2193
Dudu		2189–2169
Shu-turul		2168–2154

The Akkadian Empire takes its name from the region and the city of Akkad, both of which were localized in the general confluence area of the Tigris and Euphrates Rivers. Although the city of Akkad has not yet been identified on the ground, it is known from various textual sources. Among these is at least one text predating the reign of Sargon. Together with the fact that the name Akkad is of non-Akkadian origin, this suggests that the city of Akkad may have already been occupied in pre-Sargonic times.

The earliest records in the Akkadian language date to the time of Sargon of Akkad, who defeated the Sumerian king Lugal-zage-si at the Battle of Uruk and conquered his former territory, establishing the Akkadian Empire. Sargon was claimed to be the son of a gardener in the Sumerian King List. Later legends named his father as La'ibum or Itti-Bel and his birth mother as a priestess (or possibly even a hierodule) of Ishtar, the Akkadian equivalent of the Sumerian goddess Inanna. One legend of Sargon from Neo-Assyrian times quotes him as saying

My mother was a changeling, my father I knew not. The brothers of my father loved the hills. My city is Azurpiranu (the wilderness herb fields), which is situated on the banks of the Euphrates. My changeling mother conceived me, in secret she bore me. She set me in a basket of rushes, with bitumen she sealed my lid. She cast me into the river which rose not over me. The river bore me up and carried me to Akki, the drawer of water. Akki, the drawer of water, took me as his son and reared me. Akki the drawer of water, appointed me as his gardener. While I was gardener Ishtar granted me her love, and for four and (fifty?) ... years I exercised kingship.

Later claims made on behalf of Sargon were that his mother was an "entu" priestess (high priestess). The claims might have been made to ensure a pedigree of nobility, since only a highly placed family could achieve such a position.

Originally a cupbearer (Rabshakeh) to a king of Kish with a Semitic name, Ur-Zababa, Sargon thus became a gardener, responsible for the task of clearing out irrigation canals. The royal cupbearer at this time was in fact a prominent political position, close to the king and with various high level responsibilities not suggested by the title of the position itself. This gave him access to a disciplined corps of workers, who also may have served as his first soldiers. Displacing Ur-Zababa, Sargon was crowned king, and he entered upon a career of foreign conquest. Four times he invaded Syria and Canaan, and he spent three years thoroughly subduing the countries of "the west" to unite them with Mesopotamia "into a single empire".

However, Sargon took this process further, conquering many of the surrounding regions to create an empire that reached westward as far as the Mediterranean Sea and perhaps Cyprus (Kaptara); northward as far as the mountains (a later Hittite text asserts he fought the Hattian king Nurdaggal of Burushanda, well into Anatolia); eastward over Elam; and as far south as Magan (Oman) — a region over which he reigned for purportedly 56 years, though only four "year-names" survive. He consolidated his dominion over his territories by replacing the earlier opposing rulers with noble citizens of Akkad, his native city where loyalty was thus ensured.

Trade extended from the silver mines of Anatolia to the lapis lazuli mines in modern Afghanistan, the cedars of Lebanon and the copper of Magan. This consolidation of the city-states of Sumer and Akkad reflected the growing economic and political power of Mesopotamia. The empire's breadbasket was the rain-fed agricultural system and a chain of fortresses was built to control the imperial wheat production.

Images of Sargon were erected on the shores of the Mediterranean, in token of his victories, and cities and palaces were built at home with the spoils of the conquered lands. Elam and the northern part of Mesopotamia were also subjugated, and rebellions in Sumer were put down. Contract tablets have been found dated in the years of the campaigns against Canaan and against Sarlak, king of Gutium. He also boasted of having subjugated the "four-quarters" — the lands surrounding Akkad to the north, the south (Sumer), the east (Elam), and the west (Martu). Some of the earliest historiographic texts (ABC 19, 20) suggest he rebuilt the city of Babylon (Bab-ilu) in its new location near Akkad.

Sargon, throughout his long life, showed special deference to the Sumerian deities, particularly Inanna (Ishtar), his patroness, and Zababa, the warrior god of Kish. He called himself "The anointed priest of Anu" and "the great ensi of Enlil" and his daughter, Enheduanna, was installed as priestess to Nanna at the temple in Ur.

Troubles multiplied toward the end of his reign. A later Babylonian text states:

In his old age, all the lands revolted against him, and they besieged him in Akkad (the city) [but] he went forth to battle and defeated them, he knocked them over and destroyed their vast army.

It refers to his campaign in "Elam", where he defeated a coalition army led by the King of Awan and forced the vanquished to become his vassals.

Also shortly after, another revolt took place:

the Subartu the upper country—in their turn attacked, but they submitted to his arms, and Sargon settled their habitations, and he smote them grievously.

The Bible refers to the city of Akkad in the Book of Genesis, which states:

"Cush [grandson of Noah] became the father of Nimrod; he was the first on earth to become a mighty warrior. He was a mighty hunter before the Lord; therefore it is said, “Like Nimrod a mighty hunter before the Lord.” The beginning of his kingdom was Babel, Erech, and Accad, all of them in the land of Shinar. From that land he went into Assyria, and built Nineveh, Rehoboth-ir, Calah, and Resen between Nineveh and Calah; that is the great city."

Nimrod's historical inspiration remains uncertain, but he has been identified with Sargon of Akkad by some scholars who also propose that the name of Sargon's grandson and successor Naram-Sin is the root of Nimrod's, while others have noted similarities between Nimrod and the legendary Gilgamesh, king of Uruk (Erech).

Sargon had crushed opposition even at old age. These difficulties broke out again in the reign of his sons, where revolts broke out during the nine-year reign of Rimush (2278–2270 BC), who fought hard to retain the empire, and was successful until he was assassinated by some of his own courtiers. According to his inscriptions, he faced widespread revolts, and had to reconquer the cities of Ur, Umma, Adab, Lagash, Der, and Kazallu from rebellious ensis: Rimush introduced mass slaughter and large scale destruction of the Sumerian city-states, and maintained meticulous records of his destructions. Most of the major Sumerian cities were destroyed, and Sumerian human losses were enormous:

Sumerian casualties from the campaigns of Rimush
Destroyed cities:	Adab and Zabala	Umma and KI.AN	Ur and Lagash	Kazallu	(Three battles in Sumer)	TOTAL
Killed	15,718	8,900	8,049	12,052	11,322	56,041
Captured and enslaved	14,576	3,540	5,460	5,862	_	29,438
"Expelled and annihilated"	_	5,600	5,985	_	14,100	25,685

Rimush's elder brother, Manishtushu (2269–2255 BC) succeeded him. The latter seems to have fought a sea battle against 32 kings who had gathered against him and took control over their pre-Arab country, consisting of modern-day United Arab Emirates and Oman. Despite the success, like his brother he seems to have been assassinated in a palace conspiracy.

Manishtushu's son and successor, Naram-Sin (2254–2218 BC), due to vast military conquests, assumed the imperial title "King Naram-Sin, king of the four-quarters" (Lugal Naram-Sîn, Šar kibrat 'arbaim), the four-quarters as a reference to the entire world. He was also for the first time in Sumerian culture, addressed as "the god (Sumerian = DINGIR, Akkadian = ilu) of Agade" (Akkad), in opposition to the previous religious belief that kings were only representatives of the people towards the gods. He also faced revolts at the start of his reign, but quickly crushed them.

Naram-Sin also recorded the Akkadian conquest of Ebla as well as Armanum and its king.

To better police Syria, he built a royal residence at Tell Brak, a crossroads at the heart of the Khabur River basin of the Jezirah. Naram-Sin campaigned against Magan which also revolted; Naram-Sin "marched against Magan and personally caught Mandannu, its king", where he instated garrisons to protect the main roads. The chief threat seemed to be coming from the northern Zagros Mountains, the Lulubis and the Gutians. A campaign against the Lullubi led to the carving of the "Victory Stele of Naram-Suen", now in the Louvre. Hittite sources claim Naram-Sin of Akkad even ventured into Anatolia, battling the Hittite and Hurrian kings Pamba of Hatti, Zipani of Kanesh, and 15 others.

The economy was highly planned. Grain was cleaned, and rations of grain and oil were distributed in standardized vessels made by the city's potters. Taxes were paid in produce and labour on public walls, including city walls, temples, irrigation canals and waterways, producing huge agricultural surpluses. This newfound Akkadian wealth may have been based upon benign climatic conditions, huge agricultural surpluses and the confiscation of the wealth of other peoples.

In later Assyrian and Babylonian texts, the name Akkad, together with Sumer, appears as part of the royal title, as in the Sumerian LUGAL KI-EN-GI KI-URI or Akkadian Šar māt Šumeri u Akkadi, translating to "king of Sumer and Akkad". This title was assumed by the king who seized control of Nippur, the intellectual and religious center of southern Mesopotamia.

During the Akkadian period, the Akkadian language became the lingua franca of the Middle East, and was officially used for administration, although the Sumerian language remained as a spoken and literary language. The spread of Akkadian stretched from Syria to Elam, and even the Elamite language was temporarily written in Mesopotamian cuneiform. Akkadian texts later found their way to far-off places, from Egypt (in the Amarna Period) and Anatolia, to Persia (Behistun).

The submission of some Sumerian rulers to the Akkadian Empire, is recorded in the seal inscriptions of Sumerian rulers such as Lugal-ushumgal, governor (ensi) of Lagash ("Shirpula"), circa 2230–2210 BC. Several inscriptions of Lugal-ushumgal are known, particularly seal impressions, which refer to him as governor of Lagash and at the time a vassal (𒀵, arad, "servant" or "slave") of Naram-Sin, as well as his successor Shar-kali-sharri. One of these seals proclaims:

“Naram-Sin, the mighty God of Agade, king of the four corners of the world, Lugal-ushumgal, the scribe, ensi of Lagash, is thy servant.”

— Seal of Lugal-ushumgal as vassal of Naram-sin.

It can be considered that Lugal-ushumgal was a collaborator of the Akkadian Empire, as was Meskigal, ruler of Adab. Later however, Lugal-ushumgal was succeeded by Puzer-Mama who, as Akkadian power waned, achieved independence from Shar-Kali-Sharri, assuming the title of "King of Lagash" and starting the illustrious Second Dynasty of Lagash.

The empire of Akkad likely fell in the 22nd century BC, within 180 years of its founding, ushering in a "Dark Age" with no prominent imperial authority until the Third Dynasty of Ur. The region's political structure may have reverted to the status quo ante of local governance by city-states.

By the end of Sharkalisharri's reign, the empire had begun to unravel. After several years of chaos (and four kings), Shu-turul and Dudu appear to have restored some centralized authority for several decades; however, they were unable to prevent the empire from eventually collapsing outright, eventually ceding power to Gutians, based in Adab, who had been conquered by Akkad during the reign of Sharkalisharri.

Little is known about the Gutian period, or how long it endured. Cuneiform sources suggest that the Gutians' administration showed little concern for maintaining agriculture, written records, or public safety; they reputedly released all farm animals to roam about Mesopotamia freely and soon brought about famine and rocketing grain prices. The Sumerian king Ur-Nammu (2112–2095 BC) cleared the Gutians from Mesopotamia during his reign.

The Sumerian King List, describing the Akkadian Empire after the death of Shar-kali-shari, states:

Who was king? Who was not king? Irgigi the king; Nanum, the king; Imi the king; Ilulu, the king—the four of them were kings but reigned only three years. Dudu reigned 21 years; Shu-Turul, the son of Dudu, reigned 15 years. ... Agade was defeated and its kingship carried off to Uruk. In Uruk, Ur-ningin reigned 7 years, Ur-gigir, son of Ur-ningin, reigned 6 years; Kuda reigned 6 years; Puzur-ili reigned 5 years, Ur-Utu reigned 6 years. Uruk was smitten with weapons and its kingship carried off by the Gutian hordes.

However, there are no known year-names or other archaeological evidence verifying any of these later kings of Akkad or Uruk, apart from several artefact referencing king Dudu of Akkad and Shu-turul. The named kings of Uruk may have been contemporaries of the last kings of Akkad, but in any event could not have been very prominent.

In the Gutian hordes, (first reigned) a nameless king; (then) Imta reigned 3 years as king; Shulme reigned 6 years; Elulumesh reigned 6 years; Inimbakesh reigned 5 years; Igeshuash reigned 6 years; Iarlagab reigned 15 years; Ibate reigned 3 years; ... reigned 3 years; Kurum reigned 1 year; ... reigned 3 years; ... reigned 2 years; Iararum reigned 2 years; Ibranum reigned 1 year; Hablum reigned 2 years; Puzur-Sin son of Hablum reigned 7 years; Iarlaganda reigned 7 years; ... reigned 7 years; ... reigned 40 days. Total 21 kings reigned 91 years, 40 days.

The period between c. 2112 BC and 2004 BC is known as the Ur III period. Documents again began to be written in Sumerian, although Sumerian was becoming a purely literary or liturgical language, much as Latin later became in Medieval Europe.

One explanation for the end of the Akkadian empire is simply that the Akkadian dynasty could not maintain its political supremacy over other independently powerful city-states.

One theory, which remains controversial, associates regional decline at the end of the Akkadian period (and of the First Intermediary Period following the Old Kingdom in Ancient Egypt) with rapidly increasing aridity, and failing rainfall in the region of the Ancient Near East, caused by a global centennial-scale drought, sometimes called the 4.2 kiloyear event. Harvey Weiss has shown that

[A]rchaeological and soil-stratigraphic data define the origin, growth, and collapse of Subir, the third millennium rain-fed agriculture civilization of northern Mesopotamia on the Habur Plains of Syria. At 2200 BC, a marked increase in aridity and wind circulation, subsequent to a volcanic eruption, induced a considerable degradation of land-use conditions. After four centuries of urban life, this abrupt climatic change evidently caused abandonment of Tell Leilan, regional desertion, and the collapse of the Akkadian empire based in southern Mesopotamia. Synchronous collapse in adjacent regions suggests that the impact of the abrupt climatic change was extensive.

Peter B. de Menocal has shown "there was an influence of the North Atlantic Oscillation on the streamflow of the Tigris and Euphrates at this time, which led to the collapse of the Akkadian Empire". More recent analysis of simulations from the HadCM3 climate model indicate that there was a shift to a more arid climate on a timescale that is consistent with the collapse of the empire.

Excavation at Tell Leilan suggests that this site was abandoned soon after the city's massive walls were constructed, its temple rebuilt and its grain production reorganized. The debris, dust, and sand that followed show no trace of human activity. Soil samples show fine wind-blown sand, no trace of earthworm activity, reduced rainfall and indications of a drier and windier climate. Evidence shows that skeleton-thin sheep and cattle died of drought, and up to 28,000 people abandoned the site, presumably seeking wetter areas elsewhere. Tell Brak shrank in size by 75%. Trade collapsed. Nomadic herders such as the Amorites moved herds closer to reliable water suppliers, bringing them into conflict with Akkadian populations. This climate-induced collapse seems to have affected the whole of the Middle East, and to have coincided with the collapse of the Egyptian Old Kingdom.

This collapse of rain-fed agriculture in the Upper Country meant the loss to southern Mesopotamia of the agrarian subsidies which had kept the Akkadian Empire solvent. Water levels within the Tigris and Euphrates fell 1.5 meters beneath the level of 2600 BC, and although they stabilized for a time during the following Ur III period, rivalries between pastoralists and farmers increased. Attempts were undertaken to prevent the former from herding their flocks in agricultural lands, such as the building of a 180 km (112 mi) wall known as the "Repeller of the Amorites" between the Tigris and Euphrates under the Ur III ruler Shu-Sin. Such attempts led to increased political instability; meanwhile, severe depression occurred to re-establish demographic equilibrium with the less favorable climatic conditions.

Richard Zettler has critiqued the drought theory, observing that the chronology of the Akkadian empire is very uncertain and that available evidence is not sufficient to show its economic dependence on the northern areas excavated by Weiss and others. He also criticizes Weiss for taking Akkadian writings literally to describe certain catastrophic events.

According to Joan Oates, at Tell Brak, the soil "signal" associated with the drought lies below the level of Naram-Sin's palace. However, evidence may suggest a tightening of Akkadian control following the Brak 'event', for example, the construction of the heavily fortified 'palace' itself and the apparent introduction of greater numbers of Akkadian as opposed to local officials, perhaps a reflection of unrest in the countryside of the type that often follows some natural catastrophe. Furthermore, Brak remained occupied and functional after the fall of the Akkadians.

In 2019, a study by Hokkaido University on fossil corals in Oman provides an evidence that prolonged winter shamal seasons led to the salinization of the irrigated fields; hence, a dramatic decrease in crop production triggered a widespread famine and eventually the collapse of the ancient Akkadian Empire.

The Akkadian government formed a "classical standard" with which all future Mesopotamian states compared themselves. Traditionally, the ensi was the highest functionary of the Sumerian city-states. In later traditions, one became an ensi by marrying the goddess Inanna, legitimising the rulership through divine consent.

Initially, the monarchical lugal (lu = man, gal =Great) was subordinate to the priestly ensi, and was appointed at times of troubles, but by later dynastic times, it was the lugal who had emerged as the preeminent role, having his own "é" (= house) or "palace", independent from the temple establishment. By the time of Mesalim, whichever dynasty controlled the city of Kish was recognised as šar kiššati (= king of Kish), and was considered preeminent in Sumer, possibly because this was where the two rivers approached, and whoever controlled Kish ultimately controlled the irrigation systems of the other cities downstream.

As Sargon extended his conquest from the "Lower Sea" (Persian Gulf), to the "Upper Sea" (Mediterranean), it was felt that he ruled "the totality of the lands under heaven", or "from sunrise to sunset", as contemporary texts put it. Under Sargon, the ensis generally retained their positions, but were seen more as provincial governors. The title šar kiššati became recognised as meaning "lord of the universe". Sargon is even recorded as having organised naval expeditions to Dilmun (Bahrain) and Magan, amongst the first organised military naval expeditions in history. Whether he also did in the case of the Mediterranean with the kingdom of Kaptara (possibly Cyprus), as claimed in later documents, is more questionable.

With Naram-Sin, Sargon's grandson, this went further than with Sargon, with the king not only being called "Lord of the Four-Quarters (of the Earth)", but also elevated to the ranks of the dingir (= gods), with his own temple establishment. Previously a ruler could, like Gilgamesh, become divine after death but the Akkadian kings, from Naram-Sin onward, were considered gods on earth in their lifetimes. Their portraits showed them of larger size than mere mortals and at some distance from their retainers.

One strategy adopted by both Sargon and Naram-Sin, to maintain control of the country, was to install their daughters, Enheduanna and Emmenanna respectively, as high priestess to Sin, the Akkadian version of the Sumerian moon deity, Nanna, at Ur, in the extreme south of Sumer; to install sons as provincial ensi governors in strategic locations; and to marry their daughters to rulers of peripheral parts of the Empire (Urkesh and Marhashe). A well documented case of the latter is that of Naram-Sin's daughter Tar'am-Agade at Urkesh.

Records at the Brak administrative complex suggest that the Akkadians appointed locals as tax collectors.

The population of Akkad, like nearly all pre-modern states, was entirely dependent upon the agricultural systems of the region, which seem to have had two principal centres: the irrigated farmlands of southern Iraq that traditionally had a yield of 30 grains returned for each grain sown and the rain-fed agriculture of northern Iraq, known as the "Upper Country."

Southern Iraq during Akkadian period seems to have been approaching its modern rainfall level of less than 20 mm (0.8 in) per year, with the result that agriculture was totally dependent upon irrigation. Before the Akkadian period, the progressive salinisation of the soils, produced by poorly drained irrigation, had been reducing yields of wheat in the southern part of the country, leading to the conversion to more salt-tolerant barley growing. Urban populations there had peaked already by 2,600 BC, and demographic pressures were high, contributing to the rise of militarism apparent immediately before the Akkadian period (as seen in the Stele of the Vultures of Eannatum). Warfare between city states had led to a population decline, from which Akkad provided a temporary respite. It was this high degree of agricultural productivity in the south that enabled the growth of the highest population densities in the world at this time, giving Akkad its military advantage.

The water table in this region was very high and replenished regularly—by winter storms in the headwaters of the Tigris and Euphrates from October to March and from snow-melt from March to July. Flood levels, that had been stable from about 3,000 to 2,600 BC, had started falling, and by the Akkadian period were a half-meter to a meter lower than recorded previously. Even so, the flat country and weather uncertainties made flooding much more unpredictable than in the case of the Nile; serious deluges seem to have been a regular occurrence, requiring constant maintenance of irrigation ditches and drainage systems. Farmers were recruited into regiments for this work from August to October—a period of food shortage—under the control of city temple authorities, thus acting as a form of unemployment relief. Gwendolyn Leick has suggested that this was Sargon's original employment for the king of Kish, giving him experience in effectively organising large groups of men; a tablet reads, "Sargon, the king, to whom Enlil permitted no rival—5,400 warriors ate bread daily before him".

Harvest was in the late spring and during the dry summer months. Nomadic Amorites from the northwest pastured their flocks of sheep and goats to graze on the crop residue and were watered from the river and irrigation canals. For this privilege, they had to pay a tax in wool, meat, milk, and cheese to the temples, who distributed these products to the bureaucracy and priesthood. In good years, all went well, but in bad years, wild winter pastures were in short supply, nomads sought to pasture their flocks in the grain fields, resulting in conflicts with farmers. It appeared that the subsidizing of southern populations by the import of wheat from the north of the Empire temporarily overcame this problem, and it seems to have allowed economic recovery and a growing population within this region.

As a result, Sumer and Akkad had a surplus of agricultural products but was short of almost everything else, particularly metal ores, timber and building stone, all of which had to be imported. The spread of the Akkadian state as far as the "silver mountain" (possibly the Taurus Mountains), the "cedars" of Lebanon, and the copper deposits of Magan, was largely motivated by the goal of securing control over these imports. One tablet, an Old Babylonian Period copy of an original inscription, reads:

"Sargon, the king of Kish, triumphed in thirty-four battles (over the cities) up to the edge of the sea (and) destroyed their walls. He made the ships from Meluhha, the ships from Magan (and) the ships from Dilmun tie up alongside the quay of Agade. Sargon the king prostrated himself before (the god) Dagan (and) made supplication to him; (and) he (Dagan) gave him the upper land, namely Mari, Yarmuti, (and) Ebla, up to the Cedar Forest (and) up to the Silver Mountain"

— Inscription by Sargon of Akkad (ca.2270–2215 BC)

International trade developed during the Akkadian period. Indus–Mesopotamia relations also seem to have expanded: Sargon of Akkad (circa 2300 or 2250 BC), was the first Mesopotamian ruler to make an explicit reference to the region of Meluhha, which is generally understood as being the Balochistan or the Indus area.

In art, there was a great emphasis on the kings of the dynasty, alongside much that continued earlier Sumerian art. Little architecture remains. In large works and small ones such as seals, the degree of realism was considerably increased, but the seals show a "grim world of cruel conflict, of danger and uncertainty, a world in which man is subjected without appeal to the incomprehensible acts of distant and fearful divinities who he must serve but cannot love. This sombre mood ... remained characteristic of Mesopotamian art..."

Akkadian sculpture is remarkable for its fineness and realism, which shows a clear advancement compared to the previous period of Sumerian art.

• 
  The Bassetki statue, another example of Akkadian artistic realism
• 
  The Manishtushu statue
• 
  Statue of an Akkadian ruler. From Assur, Iraq, c. 2300 BC. Pergamon Museum.
• 
  Fragment of the statue of a devotee, with inscription in the name of Naram-Sin: "To the god Erra, for the life of Naram-Sin, the powerful, his companion, the king of the four regions, Shu'astakkal, the scribe, the majordomo, has dedicated his statue".

The Akkadians used visual arts as a vehicle of ideology. They developed a new style for cylinder seals by reusing traditional animal decorations but organizing them around inscriptions, which often became central parts of the layout. The figures also became more sculptural and naturalistic. New elements were also included, especially in relation to the rich Akkadian mythology.

• 
  Inscription "Adda, the scribe", hunting god with bow and an arrow, Ishtar with weapons rising from her shoulders, emerging sun-god Shamash, Zu bird of destiny, water god Ea with bull between legs, two-faced attendant god Usimu with right hand raised.
• 
  Akkadian seal depicting an agricultural scene. Louvre Museum
• 
  Summer God and Dumuzi. Louvre Museum
• 
  Ea wrestling with a water buffalo, and bull-man Enkidu fighting with a lion.

During the 3rd millennium BC, there developed a very intimate cultural symbiosis between the Sumerians and the Akkadians, which included widespread bilingualism. The influence of Sumerian on Akkadian (and vice versa) is evident in all areas, from lexical borrowing on a massive scale, to syntactic, morphological, and phonological convergence. This has prompted scholars to refer to Sumerian and Akkadian in the third millennium as a sprachbund.

Akkadian gradually replaced Sumerian as a spoken language somewhere around 2000 BC (the exact dating being a matter of debate), but Sumerian continued to be used as a sacred, ceremonial, literary, and scientific language in Mesopotamia until the 1st century AD.

Sumerian literature continued in rich development during the Akkadian period. Enheduanna, the "wife (Sumerian dam = high priestess) of Nanna [the Sumerian moon god] and daughter of Sargon" of the temple of Sin at Ur, who lived c. 2285–2250 BC, is the first poet in history whose name is known. Her known works include hymns to the goddess Inanna, the Exaltation of Inanna and In-nin sa-gur-ra. A third work, the Temple Hymns, a collection of specific hymns, addresses the temples and their occupants, the deities to whom they were consecrated. The works of this poet are significant, because although they start out using the third person, they shift to the first person voice of the poet herself, and they mark a significant development in the use of cuneiform. As poet, princess, and priestess, she was a person who, according to William W. Hallo, "set standards in all three of her roles for many succeeding centuries"

In the Exultation of Inanna,

Enheduanna depicts Inanna as disciplining mankind as a goddess of battle. She thereby unites the warlike Akkadian Ishtar's qualities to those of the gentler Sumerian goddess of love and fecundity. She likens Inanna to a great storm bird who swoops down on the lesser gods and sends them fluttering off like surprised bats. Then, in probably the most interesting part of the hymn, Enheduanna herself steps forward in the first person to recite her own past glories, establishing her credibility, and explaining her present plight. She has been banished as high priestess from the temple in the city of Ur and from Uruk and exiled to the steppe. She begs the moon god Nanna to intercede for her because the city of Uruk, under the ruler Lugalanne, has rebelled against Sargon. The rebel, Lugalanne, has even destroyed the temple Eanna, one of the greatest temples in the ancient world, and then made advances on his sister-in-law.

The kings of Akkad were legendary among later Mesopotamian civilizations, with Sargon understood as the prototype of a strong and wise leader, and his grandson Naram-Sin considered the wicked and impious leader (Unheilsherrscher in the analysis of Hans Gustav Güterbock) who brought ruin upon his kingdom.

A tablet from the periods reads, "(From the earliest days) no-one had made a statue of lead, (but) Rimush king of Kish, had a statue of himself made of lead. It stood before Enlil; and it recited his (Rimush's) virtues to the idu of the gods". The copper Bassetki Statue, cast with the lost wax method, testifies to the high level of skill that craftsmen achieved during the Akkadian period.

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• Liverani, Mario, ed. (1993). Akkad: The First World Empire: Structure, Ideology Traditions. Padova: Sargon srl. ISBN 978-8-81120-468-8
• Oates, Joan (2004). "Archaeology in Mesopotamia: Digging Deeper at Tell Brak". 2004 Albert Reckitt Archaeological Lecture. In Proceedings of the British Academy: 2004 Lectures; Oxford University Press, 2005. ISBN 978-0-19726-351-8.
• Zettler, Richard L. (2003). "Reconstructing the World of Ancient Mesopotamia: Divided Beginnings and Holistic History". Journal of the Economic and Social History of the Orient. 46 (1): 3–45. doi:10.1163/156852003763504320. JSTOR 3632803.

• Gough, M.A, Historical Perception in the Sargonic Literary Tradition. The Implication of Copied Texts, Rosetta 1, pp 1–9, 2006
• [10] Paszke, Marcin Z, "From Sargon To Narām-Sîn: some remarks on Akkadian military activity in the II nd half of the III rd millennium bc. The example of eastern campaigns", Acta Archaeologica Lodziensia 68, pp. 75–83, 2022
• Sallaberger, Walther; Westenholz, Aage (1999), Mesopotamien. Akkade-Zeit und Ur III-Zeit, Orbis Biblicus et Orientalis, vol. 160/3, Göttingen: Vandenhoeck & Ruprecht, ISBN 978-3-525-53325-3
• E. A. Speiser, "Some Factors in the Collapse of Akkad", Journal of the American Oriental Society, vol. 72, no. 3, pp. 97–101, (Jul. - Sep. 1952)

• Iraq's Ancient Past – Penn Museum
• Year Names of Narim-Sin – CDLI
• Year Named of Shar-kali-Sharri – CDLI
• Site on Enheduanna at Virginia Tech University (archived 12 December 2009)

33°6′N 44°6′E / 33.100°N 44.100°E / 33.100; 44.100