RD
Robert de Ferrers 6th Earl of Derby
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Robert de Ferrers, 6th Earl of Derby (d.1279), who forfeited the earldom in 1266 after opposing the Crown; father of John de Ferrers of Chartley.
Research notes
✓ DOCUMENTED (CP FERRERS/Derby; supplied 8 Aug 2026). LOOP: wired as a son of William de Ferrers, 5th Earl of Derby (I100491) x Margaret de Quincy (F100119) - brother of William of Groby (I100596) and Joan de Ferrers - so the Chartley line braids into the Ferrers Earls of Derby. His wife Eleanor de Bohun (mother of John I) left note-only. Added 8 Aug 2026.