When copying data from this family tree, please include a reference to the origin: Gordon Gray Warder Jr, "Warder Family Tree", database, Genealogy Online (https://www.genealogieonline.nl/warder-family-tree/I340048131030.php : accessed May 13, 2025), "Gerberga "Gerberge" Boulogne (Gerberga "Gerberge" Boulogne) de Luxembourg (± 1020-1059)".
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