IM
Isabel Mauduit
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About
Isabel Mauduit was sister and heiress of the last Mauduit Earl of Warwick; through her the earldom passed to the Beauchamps.
Research notes
✓ ISABEL MAUDUIT, sister and h. of William Mauduit 8th Earl of Warwick; wife of William de Beauchamp of Elmley; mother of the 9th Earl (our line). Standard well-documented English comital genealogy (CP Warwick), web-confirmed 6 Aug 2026; contested rungs note-only, not hardened.