Daughter of Jacques (James) Saint Hilary du Harcouet, and his wife, Aveline.

Wife of Sir Roger de Clare, 3rd Earl of Hertford and the son of Richard FitzGilbert de Clare and Alice de Gernon de Meschines. They had seven children:
* Mabel de Clare, wife of Nigel de Mowbray
* Richard de Clare, Ear of Hertford
* James de Clare
* Eveline de Clare, wife of Geoffrey FitzPiers & Sir Wm Munchensy
* Roger de Clare
* John de Clare
* Henry de Clare

After Roger's death in 1173, she married William d'Aubigney, Earl of Arundel and had two more children:
William d'Aubigney, husband of Mabel of Chester
Matilda d'Aubigney, wife of William de Warenne (findagrave.com)