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.
Companions of William the Conqueror been drawn up over the ages but, unless new evidence turns up, all are conjecture of no historical value. The three unchallenged sources remain as follows: The following three sources constitute the only generally accepted reliable contemporary evidence which names participants at the Battle of Hastings. Between all three sources only 15 names result. These three sources are unfortunately manifestly inadequate, as all are primarily from a Norman perspective. William of Poitiers, chamberlain to Duke William and a trained knight, who provides the most detail, was absent in France during the battle, and betrays severe prejudices in respect of Breton