When copying data from this family tree, please include a reference to the origin: J.W. Martens, "Family tree Martens IJsselstreek", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-martens-ijsselstreek/I101754.php : accessed September 25, 2024), "Hedwig Prinses van Brandenburg van Ballenstedt (± 1131-1203)".
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