When copying data from this family tree, please include a reference to the origin: Henriëtte Gijsbertha de Beer, "Ancestors Henriëtte Gijsbertha de Beer", database, Genealogy Online (https://www.genealogieonline.nl/kwartierstaat-henriette-gijsbertha-de-beer/I8501.php : accessed June 24, 2024), "Siemomysl van Polen (Van de Polanen) (????-995)".
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