Guillaume was the son of Armengol III de Urgel and Clémence de Foix. The date and place of his birth have not been found.
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Armengol III de Urgel |
Armengol II |
Armengol I de Barcelone |
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Gerberge de Provence |
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Constance Velasquita de Besalú |
Bernard I Taillefer de Besalú |
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Toda de Provence |
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Clémence de Foix |
Bernard II de Bigorre |
Bernard-Roger I de Foix |
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Gersende de Bigorre |
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Clémence de Barcelone |
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