When copying data from this family tree, please include a reference to the origin: Gé Lobé, "Family tree Lobé en verwanten.", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-lobe/I80243.php : accessed February 17, 2026), "Bertrade OR Bertrande van IJsselstein (± 1175-± 1233)".
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