William III De Ferrers
William III was born about 1193 in Derby, Derbys, Eng..  He died on March 24th, 1254 in St. Neots, Co. Huntingdon.  He was buried on March 31st, 1254 in Abbey of Merevale, Warwickshire, England.

 Sybil (Sibilla) Marshal
Sybil (Sibilla) was born about 1191 in Pembroke, Pembrokes, Wales.  She died on April 27th, 1245.

 Isabel De Ferrers
Isabel was born about 1225.  She died before November 26th, 1260.

 Maud Ferrers
Maud was born about 1230 in Derby, Derbys, Eng..  She died on March 12th, 1298.