When copying data from this family tree, please include a reference to the origin: Peter Stam, "Family tree Stam, De Bie, Verhaar, Paardekoper", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-stam/I1171.php : accessed May 27, 2024), "Dirk II van Valkenburg (Valkenborch) en Monschau (± 1223-1268)".
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