When copying data from this family tree, please include a reference to the origin: Ivo van den Heuvel, "Family tree Van den Heuvel-Jacobs", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-den-heuvel-jacobs/I1898.php : accessed May 30, 2024), "Gerhard I heer (Gerhard I, heer) van Hochstaden (1056-1137)".
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Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
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