Alan IV, Duke of Brittany of William the Bastard, Duke of Normandy (later to become known as William the Conqueror) support of rebels in Brittany against Alan's maternal uncle, Conan II. Conan II died in late 1066 during a campaign in Anjou, and was succeeded by Alan's parents, Conan's sister Hawise and her husband Hoel II. Hoel ruled as regent from Hawise's death in 1072 until Alan reached his majority in 1084. To prevent further hostilities during his invasion of England, William I married his daughter Constance to the new duke Alan in 1087. The marriage ceremonies may have taken place in Bayeux in Normandy.
William the Conqueror Norman cavalry. During the Bretons' flight, rumours swept through the Norman forces that the duke had been killed, but William succeeded in rallying his troops. Two further Norman retreats were feigned, to once again draw the English into pursuit and expose them to repeated attacks by the Norman cavalry. The available sources are more confused about events in the afternoon, but it appears that the decisive event was Harold's death, about which differing stories are told. William of Jumièges claimed that Harold was killed by the duke. The Bayeux Tapestry has been claimed to show Harold's death by an arrow