The name "Dinan" comes from two Celtic words:
"Dun" (hill height own defense) and "Ahna 'patron goddess and guardian of the living dead. The first appearance of the name "Dinan" in a document dating back to 1040. Since that time, there is a castle built on a mound, as evidenced by the Bayeux Tapestry. It overlooks the valley of the Rance and protects a town formed around the port, to the point of intersection of the waterway and the land. The population is growing rapidly on the plateau around the castle.
In 1123, the city is divided into two parishes: Saint-Malo and Saint-Sauveur. In twelfth century, Idrisi, an Arab traveler, evokes a city "surrounded by stone walls. In reality, it was clearly a rough closing.
Indeed, the true speaker will be built after 1283, which marks the date of taking possession of the city by the Duke of Brittany, John I. Le Roux. Therefore, an era of prosperity opened for the city. It represents the cornerstone of the defense of dukes and emerging as a major market place. The presence of religious convents (1232: Dominicans or Jacobins 1247-49: Franciscans or Cordeliers) reflect its economic dynamism. The situation deteriorated after the war of succession of Brittany (1341-1364). Dinan is the party of Charles de Blois belongs Bertrand du Guesclin defending the city against British troops in 1357. It was during this siege occurred the battle of Guesclin and Thomas of Canterbury. John IV, who won the war, built the tower in 1380.
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