Yves was probably the son of Yves de Creil,[a][1] one of those who saved young Duke Richard I from death or mutilation at hand of King Louis IV of France.
[2] Yves de Bellême held the castle and lands of Bellême, of the King of France, as well as the Sonnois and part of the Passais, both held of the Count of Maine.
[3] That he held part of the march-lands of Passais is known from his having given abbot Gauzlin of Fleury Abbey the lands of Magny-le-Désert.
[1] His wife was named Godeheut and although her parentage is unknown, she was the sister of Seinfroy, Bishop of Le Mans.
[6] Yves de Bellême and his wife Godeheut had five children: