WD
William de Ferrers 4th Earl of Derby
d. 1247
Vitals
Died
1247
Family
Spouse
About
The fourth Earl of Derby married a daughter of the Earl of Chester and stood among the Magna Carta counsellors.
Research notes
✓ WILLIAM de FERRERS, 4th Earl of DERBY (c.1168-1247); m. Agnes de Kevelioc; father of the 5th Earl (our line). Standard well-documented English baronial genealogy (CP; web-confirmed 7 Aug 2026); contested rungs note-only, not hardened.