No issue
Isabel de Warenne, Countess of Surrey (d. 1203)
• William I, Count of Boulogne, Earl of Surrey (1137?–1159), her first husband, younger son of
King Stephen of England.
The Earldom of Surrey was first created in 1088 for
William de Warenne, as a reward for loyal service to William during the Conquest. He received the lordship of
Reigate Castle in Surrey, but also had holdings in twelve other counties. Perhaps because he held little property in
Surrey, the earldom came to be more commonly called of Warenne. The name Warenne comes from the name of their property in Normandy where the family's ancestral castle,
Bellencombre, was located on the
Varenne River. It was held by William de Warenne's son and grandson, both also named William, and then by the husbands of Isabella, daughter of the third William de Warenne. The first of these was
William of Blois, son of King
Stephen, and the second was
Hamelin, half-brother of
Henry II. The latter took the de Warenne surname, and a son, grandson, and great-great-grandson of Hamelin and Isabella subsequently held the earldom. With the failure of the second de Warenne male line in 1347, the earldom passed to
Richard FitzAlan, 10th Earl of Arundel, who was a nephew of the last de Warenne earl, although he did not assume the title until after the death of the previous earl's widow in 1351. It was also held by his son, who forfeited it upon his execution in 1397.