Gen 24 - 25 de Ferrers (ext. links)

William II de Ferrers (b. bef 1170 Tutbury, Burton-on-Trent, Staffordshire, England - d. September 22, 1247 Duffield, Belper, Derbyshire, England) Earl of Derby

Agnes de Kevelioc (b. abt 1174 Chester, Cheshire, England - d. November 2, 1247 Chartley Castle, Staffordshire, England)

children: William III, Bertha, Sybil

William III de Ferrers (b. abt 1193 Tutbury, Burton-on-Trent, Staffordshire, England - d. between March 24-28, 1253/4 Evington, Billesdon, Leicestershire, England) Earl of Derby
Sibyl Marshal (b. abt 1191 Pembroke, Pembrokeshire, Wales - d. bef 1238)
children: Isabel, Agnes, Matilda "Maud", Sibyl, Eleanor, Joan, Agatha
Margaret de Quincy (b. abt 1223 Winchester, Hamptonshire, England - d. bef March 12, 1280/1 Groby, Leicestershire, England)
children: Robert, William, Joan, Cecila (Cecily), Agnes