When copying data from this family tree, please include a reference to the origin: Lucas Verberne, "Family tree Koolen, Van Bekkum, Verberne", database, Genealogy Online (https://www.genealogieonline.nl/family-tree-koolen-van-bekkum-verberne/I12490.php : accessed November 17, 2025), "Robert VI de Clermont d'Auvergne (1205-1252)".
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