Nielsen Hayden genealogy
Michael Andrews-Reading, "The Will of Dame Isabella FitzWilliam, 1348." Foundations, journal of the Foundation for Medieval Genealogy, volume 14, 2022.
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Title Michael Andrews-Reading, "The Will of Dame Isabella FitzWilliam, 1348." Foundations, journal of the Foundation for Medieval Genealogy, volume 14, 2022. Source ID S6267 Linked to (2) Isabel Deincourt
William fitz William