He also possessed the third penny (entitlement to one third of the fines levied in the county courts) of County Surrey and held the castles of Mortemer and Bellencombre in Normandy.
This village is possibly the source of the medieval family name of Mortimer.
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He claims that Roger of Mortemer was the brother of "William, later to be Earl of Surrey".
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But possibly Robert missed out a generation, as he did in dealing with the family history of the Montgomerys.
His father assumed the name Mortemer after taking possession of the castle and village of Mortemer in the Pays de Bray, called sometimes Mortemer sur Eaulne or en Brai.
Following the acquisition of Normandy in April 1204, King Philip granted Renaud the county of Mortain and the honor of Warenne which was centered on the fortresses of Mortemer and Bellencombre.