When copying data from this family tree, please include a reference to the origin: Joop van der Horst, "Family tree van der Horst - Vollmuller - Slob - van der Woerd", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-j-j-van-der-horst/I2037.php : accessed May 19, 2024), "Jan I van Henegouwen (± 1218-1257)".
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