voorouders van der Ploeg-Mosterman » Sources » https://de.wikipedia.org/wiki/Stammliste_von_Pl%C3%B6tzkau_und_von_Valkenstein#Die_Grafen_von_Pl%C3%B6tzkau_(erloschen_1147)_und_die_Grafen_von_Valkenstein_(erloschen_um_1336)
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