Willem I van Gulik (-1176) was een zoon van graaf Gerard VI van Gulik. In 1142 volgde hij zijn vader op als graaf van Gulik. Willem was vader van: - Willem (-1207) - Judith, die huwde met graaf Everhard van Hengenbach, en de moeder werd van graaf Willem III.
When copying data from this family tree, please include a reference to the origin: Marcel van der Sluis, "Ancestors Van der Sluis en De Oude", database, Genealogy Online (https://www.genealogieonline.nl/kwartierstaat-van-der-sluis-en-de-oude/I8209.php : accessed May 26, 2024), "Overleden".
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