William III de Ferrers , 5th Earl of Derby
William III de was born about 1193 in Derby, Derbyshire, England.  He died before March 28th, 1254 in Evington, Leicestershire, England.  He was buried on March 31st, 1254 in Sheriff of Lancaster.

 Sibyl Marshal
Sibyl was born about 1191 in Pembroke, Pembrokeshire, Wales.  She died before 1238.

 Isabel de Ferrers
Isabel de was born about 1220 in Derby, Derbyshire, England.  She died before November 26th, 1260 in Torre Mohun, Devonshire, England.

 Agnes de Ferrers
Agnes de was born about 1222 in Ferrers, Derbyshire, England.  She died on May 11th, 1290 in Greyfriars, Scarborough, Yorkshire, England.

 Maud (Matilda) de Ferrers
Maud (Matilda) de was born about 1230 in Derby, Derbyshire, England.

 Eleanor de Ferrers
Eleanor de was born about 1232 in Derby, Derbyshire, England.  She died before October 26th, 1274 in Leeds Priory, Kent, England.

 Joan de Ferrers
Joan de was born about 1233 in Derby, Derbyshire, England.  She died before October 1267 in Addington, Surrey, England.