HD
Helen de Quincy
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About
Helen de Quincy, a sister of the Countess of Derby, married Alan la Zouche - so that Eve la Zouche and Joan de Ferrers, the two grandmothers-in-law of a single Berkeley marriage, were first cousins, both granddaughters of the Earl of Winchester.
Research notes
✓ HELEN de QUINCY, da. of ROGER de QUINCY 2nd Earl of Winchester (I100499, now in the tree - sister of Margaret de Quincy); wife of Alan la Zouche; mother of Eudo (our line). A second strand of the same Quincy loop. Standard well-documented English baronial genealogy (CP; web-confirmed 7 Aug 2026); contested rungs note-only, not hardened.