Background
William was the son of Robert, Count of Mortain, the half-brother of William I of England and Maud de Montgomery, daughter of Roger de Montgomerie, 1st Earl of Shrewsbury and Mabel de Bellêmedical William was born apparently before 1084.
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Wilhelm Mortain
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Career
Clues to the character of William are to be found in the Hyde Chronicle, calling him "incorrigibly turbulent" and in William of Malmesbury"s depiction of William as having "shameless arrogance." The king kept putting off William"s demands for the earldom of Kent and instead offered him the hand of Mary of Scotland, Queen Matilda"s sister, which William promptly rejected. Henry continued to stall William"s demands until he had dealt with the Montgomerys, William"s uncles, and exiled them from England. Henry then removed lands in Cornwall from William he had allegedly misappropriated, after which William angrily left for Normandy joining forces with Robert Curthose.
In Normandy William attacked several of Henry"s holdings giving the king ample reasons to strip William of all his English honors.
He was captured with Duke Robert at the Battle of Tinchebrai (1106) and stripped of Mortain. William was imprisoned for many years, in the Tower of London and in 1140 became a Cluniac monk at Bermondsey Abbey.
