Hamelin de Warenne, Earl of Surrey

Hamelin de Warenne, Earl of Surrey (c. 1129 – 7 May 1202) (alias Hamelin of Anjou and (anachronistically) Hamelin Plantagenet), was an Anglo-Angevin nobleman, a half-brother of King Henry II of England, and was prominent at the courts of the Plantagenet kings of England, Henry II and his sons Richard I and John.

He was an illegitimate son of Geoffrey of Anjou, and thus a half-brother of King Henry II, and an uncle of King Richard I and of King John.

King Henry II arranged for him to marry one of the wealthiest heiresses in England, Isabel de Warenne, 4th Countess of Surrey, the widow of William of Blois. Hamelin and Isabella married in April 1164, and after the marriage he was recognized as Comte de Warenne, that being the customary designation for what more technically should be Earl of Surrey. In consequence of the marriage Hamelin adopted the surname de Warenne, as did his descendants. By his wife he had one son and four daughters as follows:

Warenne's lands in England centred on Conisbrough Castle in Yorkshire, which powerful castle he built. He also possessed the "third penny" (an entitlement to one third of the fines levied in the county courts) of his County of Surrey and held the castles of Mortemer and Bellencombre in Normandy.

...
Wikipedia