Robert was the son of Gasce de Châteauneuf-en-Thimerais and Frohelina de Dreux. The date and place of his birth have not been found.
Robert de Gallardon
Gasce de Châteauneuf-en-Thimerais (-1073)
Frohelina de Dreux
Ribaud de Dreux
Hildeburge le Riche
Aubert I le Riche (-0982)
Godeheult de Bellême (c0968-1035)