William FERRERS, EARL OF DERBY
He married Sibyl Marshall Bef 14 May 1219 at of Pembroke, Pembrokeshire, Wales . Sibyl Marshall was christened at St. David's, Pembrokeshire, Wales 1209 daughter of William Marshall, Earl of Pembroke and Isabel Fitzgilbert de Clare, Countess of Pemb .
They were the parents of 3
children:
Maud (Matilda) de Ferrers
born Abt 1228.
Joan de Ferrers
born Abt 1232.
Eleanor de Ferrers
born Abt 1236.
William Ferrers, Earl of Derby died 24 Mar 1254 at Evington, Leicestershire, England .
Sibyl Marshall died 27 Apr 1245 .