When copying data from this family tree, please include a reference to the origin: Ton (ADM) Keetlaer, "De Zeeuwse familie Keetlaer", database, Genealogy Online (https://www.genealogieonline.nl/de-zeeuwse-familie-keetlaer/I3695.php : accessed May 25, 2024), "Jan I (Van Duivenvoorde) van Polanen (????-1342)".
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