Isabelle de Warenne Countess of Surrey ¹

   Another name for Isabelle was Isabel de Warenne Countess of Surrey.

  Research Notes:

From Wikipedia - Elizabeth of Vermandois :

In [Elizabeth's] second marriage, to William de Warenne, Elizabeth had three sons and two daughters (for a total of fourteen children - nine during her first marriage, and five during her second):
William de Warenne, 3rd Earl of Surrey and Warenne (b. 1119 dspm 1147) whose daughter Isabelle de Warenne, Countess of Surrey married 1stly
William, Count of Boulogne (dsp), yr son of King Stephen, and married 2ndly
Hamelin Plantagenet , an illegitimate half-brother of King Henry II of England by whom she had issue, later earls of Surrey and Warenne.

Isabelle married William of Blois, Count of Boulogne. (William of Blois, Count of Boulogne died in 1159.)

Isabelle next married Hamelin Plantagenet 5th Earl of Surrey, son of Geoffrey V Plantagenet Count of Anjou, Duke of Normandy and < >, in Apr 1164. (Hamelin Plantagenet 5th Earl of Surrey was born about 1129, died on 7 May 1202 and was buried in Chapter House, Lewes Priory, Surrey, England.)