William FERRERS, EARL OF DERBY
He married Sibyl Marshall Abt 1223 at Pembroke, P, Wales . Sibyl Marshall was born at of Pembroke, Pembrokeshire, Wales Abt 1204 daughter of William Marshall, Earl of Pembroke and Isabel Fitzgilbert, Countes-Pembroke .
They were the parents of 8
children:
Agnes de Ferrers
born Abt 1224.
Isabella de Ferrers
born Abt 1226.
Maud (Matilda) de Ferrers
born Abt 1228.
Sibyl de Ferrers
born 1230.
Joan de Ferrers
born Abt 1232.
Agatha de Ferrers
born Abt 1234.
Eleanor de Ferrers
born Abt 1236.
John Ferrers
born Abt 1238.
William Ferrers, Earl of Derby died 24 Mar 1254 at At Evington .
Sibyl Marshall died 27 Apr 1245 .