When copying data from this family tree, please include a reference to the origin: Henri Frebault, "Noblesse Européenne - European Nobility", database, Genealogy Online (https://www.genealogieonline.nl/noblesse-europeenne/I30206.php : accessed May 25, 2024), "Berchthold (Berchthold II) von Schwaben (????-917)".
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