When copying data from this family tree, please include a reference to the origin: Andre Ottenhoff, "Family tree Ottenhoff - Schilder", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-ottenhoff/I26224.php : accessed February 19, 2026), "Gijsbrecht III van IJsselstein (± 1125-± 1175)".
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