Similar arms were also adopted by his brother in law, the famous Crusader Ralph I de Beaugency who had married an older sister, Matilda.

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.

He held the title for 2 years until he was stripped of it by Henry IV, who restored the earldom to the Fitzalans.

The restored earl died in 1415 without male heirs, whereupon the earldom of Surrey became either extinct or abeyant (authorities disagree on this), while the earldom of Arundel passed to his 1st cousin once removed, who was great-grandson of the 9th Earl of Surrey (and consequently also descended from the de Warennes).

The title was revived several times during the 15th century, for John de Mowbray in 1451, and then for Richard of Shrewsbury in 1477.