When copying data from this family tree, please include a reference to the origin: Pieter C. Bismeijer, "Bißmeyer-Bissmeyer-Bismeyer-Bismeijer Family", database, Genealogy Online (https://www.genealogieonline.nl/bismeijer-family/I69073.php : accessed June 24, 2024), "Otto 'the Younger' von Braunschweig, Elector of Hildesheim (????-1279)".
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