When copying data from this family tree, please include a reference to the origin: Henk van Voorst, "Van Voorst-Notten - Zijdemans-de Groot", database, Genealogy Online (https://www.genealogieonline.nl/genealogie-van-voorst/I9202.php : accessed June 11, 2024), "Willem III van Chalon van Thiers (????-> 1190)".
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