When copying data from this family tree, please include a reference to the origin: Sjoerd Willems, "Family tree Willems - Van den Heuvel", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-willems-van-den-heuvel/I07826.php : accessed May 30, 2024), "Berthold von Schwaben (± 770-± 815)".
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