When copying data from this family tree, please include a reference to the origin: Tom Terveer, "Family tree Terveer, Blankertz, Gerhards", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-terveer-blankertz-gerhards/I162316161719.php : accessed June 5, 2024), "Liudolf von Friesland (????-1038)".
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