William de Ferrers 4th Earl Of Derby
- Born: Abt 1168, Tutbury, Staffordshire, England
- Marriage (1): Agnes of Chester on 2 Nov 1192 in Cheshire, England
- Died: 22 Sep 1247, Duffield, Derbyshire, England aged about 79
- Buried: After 22 Sep 1247, Chartley Castle, Staffordshire, England
FamilySearch ID: LBRP-85B.
William married Agnes of Chester, daughter of Hugh II de Cyfeiliog and Bertrade de Montfort, on 2 Nov 1192 in Cheshire, England. (Agnes of Chester was born on 16 Aug 1174 in Tutbury, Staffordshire, England, died on 2 Nov 1247 in Stowe-by-Chartley, Staffordshire, England and was buried after 2 Nov 1247 in Chartley Castle, Staffordshire, England.)
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