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/I162316173299.php : accessed May 20, 2024), "Johann von Conteville (959-????)".
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