Josselin Castle (French: Château de Josselin, Breton: Kastell Josilin, Latin: Castellum Joscelini) is a medieval castle at Josselin, in the Morbihan department of Brittany, France, first built in 1008 by Guéthénoc, viscount of Porhoët. The town and castle were named after Guéthénoc's son, Goscelinus, and rebuilt at various times since. The current castle was built by Olivier V de Clisson after 1370. He had acquired the land as part of the dowry on his marriage to Margaret of Rohan. It has been designated as a monument historique since 1928.

Guéthénoc [fr] (or Guithenoc), vicomte of Porhoët, Rohan and Guéméné, began to build the first castle on the site around the year 1008, choosing a rocky promontory overlooking the valley of the Oust. The new fortress was named after Guéthénoc's son, Goscelinus [fr] (or Josselin). The name is recorded in the Cartulary of Redon Abbey (1080) as castellum et castrum Goscelini, but already by 1108 it was appearing as Castellum Joscelini.

The site chosen for the castle was excellent from both military and commercial points of view. Since the 9th century, there had also existed an annual pilgrimage in September to the Basilica of Our Lady of the Bramble [fr] (Notre-Dame du Roncier), which added greatly to the wealth of the lords and people of Josselin.

In 1154, Odo II, Viscount of Porhoët, step-father, guardian and regent of the young Conan IV, Duke of Brittany, collected the Breton lords to deprive Conan of his inheritance, but was defeated by Henry II of England, who was also Count of Anjou, whose protection Conan had sought. Henry married his fourth son, Geoffrey, to Conan's only child, Constance, Duchess of Brittany, and Henry and his son pulled Josselin Castle down in 1168 and 1175. Henry II himself led the demolition and sowed salt into the ruins.

During the Breton War of Succession (1341–1364), the garrison of Josselin fought the defenders of the nearby Castle of Ploërmel without any clear outcome. To break the impasse, the Battle of the Thirty was arranged, contested by thirty knights from each side, and took place on 26 March 1351 halfway between the two places. The men of Josselin defeated the champions of Ploërmel, who were four Bretons, six Germans and twenty Englishmen.

In 1370 the Breton soldier Olivier V de Clisson (1336–1407), later Constable of France, acquired the lordship of Josselin and built an imposing new fortress with eight towers and a keep one hundred yards across. He married his daughter Beatrice to Alain VIII of Rohan [fr], heir to the viscounts of Rohan, whose own castle was not far away.

In 1488 Francis II, Duke of Brittany, took the castle and partially demolished it. His daughter, Anne of Brittany, restored it to Jean II of Rohan, a great-grandson of Olivier V de Clisson, who transformed the property and built an imposing new house with a fine granite facade, an early example of Renaissance architecture, bringing in Italian artists and artisans. In recognition of his patroness Anne, who was both sovereign Duchess of Brittany and Queen Consort of France, at several points along the facade Rohan added her badge, the letter A beneath a cord sculpted in stone.

Banned from Josselin due to their Protestantism, René II, Viscount of Rohan, and the other Rohan men could not prevent the Duke of Mercœur, then Governor of Brittany, from turning their castle into a base for the Catholic League in its struggles against Henry IV of France.

In 1603, after Henry IV promoted him to a duke, Henry, Duke of Rohan, one of the leaders of the Huguenots, transferred his military headquarters to his Castle of Pontivy. In 1629, Cardinal Richelieu dismantled the keep and four of the towers at Josselin and announced to Duke Henry: "My lord, into your game of skittles I have just thrown a good ball!"

In the 18th century, the castle was no longer occupied as a seat of power, and during the years of the French Revolution and the First French Empire it became a prison and a warehouse. In 1822, Caroline, Duchess of Berry, persuaded the then Duke of Rohan, Louis-François de Rohan-Chabot to restore it.

The castle remains a residence of Josselin de Rohan, fourteenth Duke of Rohan, who was President of the region of Brittany from 1998 to 2004. A marble bust of the 13th Duke, Alain Louis Auguste de Rohan-Chabot, sculpted in 1910 by Auguste Rodin, is displayed in the antechamber, and there is also an equestrian statue of Olivier de Clisson.

The castle contains a toy and doll museum with over 5000 objects in its collection.

• 
• 
• 
• 
• 
• 
• 
• 
  Banner of the arms of the House of Rohan-Chabot, flown from the ramparts of the castle

• List of castles in France

• Official website
• Photographs of Josselin Castle at oositoo.com
• Josselin Castle at casteland.com

47°57′8″N 2°32′50″W / 47.95222°N 2.54722°W / 47.95222; -2.54722