When copying data from this family tree, please include a reference to the origin: Chris van Wincoop, "Family tree van Wincoop - Sandkuijl", database, Genealogy Online (https://www.genealogieonline.nl/stambooom-van-wincoop-sandkuijl/I5888.php : accessed June 22, 2024), "Friedrich I von Sommerschenburg Pfalzgraf Friedrich V von Sachsen (????-1121)".
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