https://en.wikipedia.org/wiki/Swietopelk_I,_Duke_of_Pomerania "His ancestry has not been conclusively established, an affiliation with the Pomerelian duke Swietopelk I (1109–1113), the Polish Piast dynasty or the Pomeranian Griffins is uncertain."
When copying data from this family tree, please include a reference to the origin: Daniel van der Ploeg, "voorouders van der Ploeg-Mosterman", database, Genealogy Online (https://www.genealogieonline.nl/genealogie-van-der-ploeg-mosterman/I17401.php : accessed June 8, 2024), "Soběslav I van Gdańsk (± 1130-± 1178)".
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