"Here the knights of Duke William fight against the men of Dinan; and Conan passed out the keys". Two successive scenes from the contemporary Bayeux Tapestry (c.1066) depicting the Battle of Dinan, one of the decisive battles of the war.
In 1065, the year before his invasion of Anglo-Saxon England, William of Normandy sent word to the surrounding countries (including Brittany), warning them against attacking his lands while he was away, on the grounds that his mission bore the papal banner.[2] However, Duke Conan promptly informed the Norman Duke that he would take the opportunity to invade the latter's Duchy.
The Battle of Dinan occurred in 1065. Harold fought on the side of Duke William, whose army had chased Duke Conan from Dol-de-Bretagne to Rennes. Duke Conan finally surrendered at Château de Dinan, Brittany. The battle is recalled in the Bayeux Tapestry (see illustration).[3]
Death of the Breton lord
During Duke Conan's 1066 campaign against Anjou, he took Pouancé and Segré, and arrived in Château-Gontier. There he was found dead on 11 December after donning poisoned riding gloves. Duke William was widely suspected.[4]
Aftermath
Duke Conan II was succeeded by his sister, Hawise, whose marriage to Hoel of Cornwall may have been a political move to consolidate and stabilize the east and west regions of the duchy.
Bretons would eventually invade England with the Normans in 1066 mainly as cavalry, which they specialized in.