Robert, Count of Mortain
11th-century Norman nobleman and the uterine half-brother of William the Conqueror / From Wikipedia, the free encyclopedia
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Robert, Count of Mortain, first Earl of Cornwall of 2nd creation (c. 1031–c. 1095) was a Norman nobleman and the half-brother (on their mother's side) of King William the Conqueror. He was one of the very few proven companions of William the Conqueror at the Battle of Hastings and as recorded in the Domesday Book of 1086 was one of the greatest landholders in his half-brother's new Kingdom of England.