When copying data from this family tree, please include a reference to the origin: Rob van Koert, "Stamboom Van Koert", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-koert/I21772.php : accessed May 30, 2023), "Guillaume van Normandië, Graaf van Eu en Hiemois (± 972-1058)".
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