Valongo (Portuguese pronunciation: [vɐˈlõɡu] ) is a Portuguese municipality located in the District of Porto and 10 km from Porto, in the northern region of Portugal.

The municipality area consists of 75.12 square kilometres (29.00 sq mi) and 94,672 inhabitants in 2021, and it is subdivided into four parishes: Alfena, Campo e Sobrado, Ermesinde and Valongo. The municipality is limited to the north by the municipality of Santo Tirso, to the northeast by Paços de Ferreira, to the east by Paredes, to the southwest by Gondomar and to the west by Maia.

The Municipality of Valongo was created in 1836 as a part of the administrative reform of the country, which occurred during the reign of D. Maria II. However, human occupation of this region predates the Roman conquest of the Iberian Peninsula.

This region was occupied by the Romans, especially for gold mining in the Serra de Santa Justa. One of the traces of Roman occupation is in the municipality name, which originated in the Latin words Vallis Longus. There are still traces that would allow the detection of two main Roman connecting roads that would cross the municipality: the Porto - Guimarães road and the Alfena - Valongo - Aguiar de Sousa / Penafiel road.

This region would then be occupied by the germanic Suebi and Visigoths and later by Arabs and Moors. Toponyms in the municipality from this period include "Luriz" of germanic origin and “Moirama”, “Ilhar Mourisco” and “Alfena” from Arabic origin.

According to Father Lopes dos Reis, a native of Valongo, “the Moors entered Hespanha enthusiastic about the holy war with the alfange in one hand and Al Koran in the other, taking over with their powerful army all the places they could pass through. In Vallongo, perhaps there was no blood at all, because the inhabitants, few and without defense, could only fearlessly try to prevent the passage to a powerful enemy from whom they had known that an army of brave people had fled in terror. That is why, when the Arabs arrived in Vallongo (716), they left their people in peace without writing it, and by means of a certain tribute they gave them the freedom to live as they did here, going to settle far from the Goda settlement, which occupied the Susão and the western part of the villa, on the plain at the edge of a stream that was later called Ilhar Mourisco.”

After the reconquest of Portus Cale (Porto) by Vímara Peres in 868, he was named a count and given control of the frontier region between the Lima and Douro rivers by Alfonso III of Asturias, therefore bringing the region under control of the Kingdom of Asturias.

From the General Inquiries of 1258, the current municipality was divided at the time between the jurisdiction (julgado) of Aguiar de Sousa - which included S. Martinho de Campo and Sobrado, and the jurisdiction of Maia, which included S. Vicente da Queimadela, Valongo and S. Lourenço de Asmes.

From the economic and social point of view, at this time, the ownership of land was the basis of the economy and the main element of survival and power. In the area of the municipality, land belonged to the King and the Clergy - particularly the Regular Clergy.

The appearance of new settlements, the progressive extension of the term of existing settlements, the multiplication of suffragan chapels and the division of property, is evidence of the notorious demographic growth of this region over the centuries. This increase in population was accompanied by the progressive development of other sectors of the economy. Industry and commerce, initially based on incipient forms, acquire a strong expression in the economy. The traditional bakery industry is an excellent example of this: its origins date back to the Low Middle Ages, but the development of wheat bread is such a development, which allowed Valongo bakers to feed the entire surrounding region and with the product of their work. This, in turn, allows them to make a decisive contribution. for the construction of the new church, the Igreja Matriz de Valongo, whose construction dates to the end of the 18th century.

At the dawn of the 19th century, Valongo experiences the hardship of the presence of Napoleon's troops, during the French Invasions. A division settled in Valongo, turning the church into a stable and plundering values from individuals and the church.

These lands, therefore, served as a stage for battles and military movements that took place between the two straying brothers: D. Pedro, on the side of the Liberals, D. Miguel, on the part of the Miguelists/Absolutists. During this period two important battles take place: the Battle of Ponte Ferreira and the Battle of the Ant. In Ermesinde, the former Convent of Nª. Mr. do Bom Despacho (now, the Church of St. Rita), became a military hospital for Miguelists forces.

By decree published on November 29, 1836, D. Maria II creates the Municipality of Valongo with the parishes of Sobrado, Campo and Gandra (which belonged to the Municipality of Baltar) and Alfena, Ermesinde and Valongo (which belonged to the Municipality of Maia).

On May 18, 1852, there was a lunch at Travagem offered by the Municipality chamber to the Royal Family composed of Queen D. Maria II, King D. Fernando II, then prince D. Pedro (future D. Pedro V) and then prince D. Luís (future D. Luís I). This lunch took place on the last visit of D. Maria II to the north of Portugal in the form of thanks for the creation of the Municipality of Valongo in 1836.

Years later, there would be another royal visit, this time by D. Luís and D. Maria Pia. "For a long time, there was still talk with great admiration of the gigantic and beautiful arches that were made in many places of passage of the procession and that gave the celebrations an admirable splendor."

Between the end of the 18th century and the beginning of the 20th century, large farming houses were built across the municipality. The road network was developed within the limits of the municipality, which began being served by transport such as the tram and train. The main artery of Valongo and Ermesinde saw the opening of commercial establishments. During this time, the local population increased with migration from the interior of Portugal.

By the middle of the 19th century, the region became an attractive site for the mining of slate, but also of antimony, tungsten and coal. At the borders of Ermesinde, large factories were set up, such as “Resineira”, “Cerâmica” - “Empresa Industrial de Ermesinde” and “Têxtil de Sá”, among others. The Municipality became the site for the expansion of industries such as metallurgy, textile manufacturing, civil construction, public works, food, wood and furniture. Compared to the other parishes, Campo and Sobrado retain a greater level of rurality. The smallholding regime sustain their living with traditional productions - the vine, the corn and the fodder, which is linked to the production of milk. New crops such as kiwi and also were introduced to the region.

Number of inhabitants
1864	1878	1890	1900	1911	1920	1930	1940	1950	1960	1970	1981	1991	2001	2011	2021
8 511	9 450	11 188	11 853	13 811	14 763	17 239	23 568	27 939	33 300	41 265	64 234	74 172	86 005	93 858	94 672

(Obs.: Number of inhabitants (Residents))

Number of inhabitants per Age Group
	1900	1911	1920	1930	1940	1950	1960	1970	1981	1991	2001	2011
0-14	4 305	5 186	5 420	6 019	8 596	9 646	12 259	15 380	19 503	16 466	15 349	15 539
15-24	2 229	2 475	2 901	3 589	4 112	5 392	5 627	6 840	11 913	13 937	13 060	10 480
25-64	4 570	5 272	5 713	6 876	9 447	11 421	13 788	16 960	28 969	38 470	49 173	55 353
= or > 65	633	633	605	782	1 051	1 390	1 626	2 085	3 849	5 299	8 423	12 486
> Age unknown	35	27	26	26	60

(Obs: From 1900 until 1950, data refers to de facto population, who were present in the region. Hence, some differences can be expected relative to the resident population.)

Administratively, the municipality is divided into 4 civil parishes (freguesias):

• Alfena
• Campo e Sobrado
• Ermesinde
• Valongo

Religious Patrimony

The municipality has a vast religious patrimony, which includes the Mother Churches, chapels, shrines, calvaries and cruises, often associated with religious festivities and local folk stories. Bugiada e Mouriscada is a festivity where populars stage a fight between Bugios (christians) and Mourisqueiros ( non-believers) by the possession of John the Baptist, alongside other folk and everyday lives activities.

Slate

There's a strong presence of slate mining industry and different transformative industries associated with slate, whose industrialization began in the 19th century and matured in the 20th century. Slate was formed 350 million years ago by a metamorphosis of shale, clay and volcanic ash that results to a fine-grained foliated rock. Common application and uses of slate can be found in writing slates, blackboards, as a roofing material, for billiard table tops and in the decoration industry. The Slate Museum (Museu da Lousa) is located in the town of Campo.

Portuguese traditional toys

Alfena is home to an industry of handmade portuguese traditional toys, made using different kinds of available, and often recycled, materials including paper, wood, plate, celluloid and plastic. Toys often depict objects used in daily tasks.

Regueifa and Biscuits

Regueifa is a form of bread popular in northern Portugal. The manufacture of bread in Valongo has been documented since the Middle Ages. In addition to being an indispensable daily food, a means of paying forums, it is likely that the biscuit was part of the sailors' rations during the period of the discoveries, thus paving the way for the manufacture of the biscuit that we know today. With the introduction of American big corn, the bread came to prominence and with the French invasions the “mollet” started to be produced. Currently, regueifa is considered a delicacy in the world of bread, with the regueifa of Valongo being famous in northern Portugal.

• Adriano Bessa (born 1976), a former footballer who played as a right-back
• Francisco Chaló (born 1964), a football manager and former footballer
• Martim Fernandes (born 2006), a professional footballer who plays as a right-back
• António Dias de Oliveira (1804-1863), the President of the Council of Ministers in 1837
• Josué Pesqueira (born 1990), known as Josué, a footballer with over 260 club caps and 4 for Portugal
• Bruno Silva (born 1988), a cyclist
• Rui Vinhas (born 1986), a cyclist