Profession: heer van Wassenaar. Hij was een zoon van Philips I van Wassenaer en Agnes Persijn van Waterlant. Hij trouwde met Bertha van Rijswijk. Dochter van Arend van Teylingen van Rijswijk (Zie Heren van Teylingen nr. 2b) en Halewijne van Egmont.
When copying data from this family tree, please include a reference to the origin: J, de Waal, "Family tree De Waal, De Dordrechtste tak", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-de-waal-dordse-tak/I7239.php : accessed May 30, 2024), "Dirk I van Wassenaer (1197-1245)".
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