Check the information Open Archives has about De Gernon.
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The Conk/Robillard Family Tree publication was prepared by Martin L. Robillard (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Martin L. Robillard, "Conk/Robillard Family Tree", database, Genealogy Online (https://www.genealogieonline.nl/conk-robillard-family-tree/P71594.php : accessed May 4, 2025), "Sir John de Gernon (1308-1382)".
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