When copying data from this family tree, please include a reference to the origin: Frank Coster, "Family tree Coster", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_coster/I9017.php : accessed January 10, 2026), "Rudolf II {koning} van Oper- en Neder-Bourgondë en Provence (± 900-937)".
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