William [Earl of Derby] FERRERS
He married Sibyl Marshall Abt 1223 . Sibyl Marshall was born at of Pembroke, Pembrokeshire, Wales Abt 1204 daughter of William Marshall and Isabel De Clare, Countess of Pembroke .
They were the parents of 8
children:
Agnes de Ferrers
born Abt 1224.
Isabella de Ferrers
born Abt 1226.
Maud or Matilda 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 [Earl of Derby] Ferrers died 24 Mar 1254 at At Evington .
Sibyl Marshall died 27 Apr 1245 .