When copying data from this family tree, please include a reference to the origin: Comte Yves d'Oultremont, "L'illustre et noble Maison d'Oultremont et ses alliances", database, Genealogy Online (https://www.genealogieonline.nl/maison-d-oultremont-et-ses-alliances/I46554.php : accessed June 24, 2024), "Welf d'Altdorf de Bourgogne (????-< 876)".
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