Norman nobleman and the half-brother of William I of England
1031 CE to 1090 CE
Robert, Count of Mortain, 2nd Earl of Cornwall (c. 1031–1090) is a Norman nobleman and the half-brother of William I of England.
He is one of the known participants at the Battle of Hastings and the time of the Domesday Book he is one of the greatest landholders in England.
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