When copying data from this family tree, please include a reference to the origin: Ger de Vries, "Family tree I.D.M. de Vries", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-i-m-d-de-vries/I34945.php : accessed June 22, 2024), "Bertold I van Stromberg (Graaf van Mayenfeld en Trechirgau) (± 945-????)".
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