Geoffrey Vicomté de Château-du-Loire et Comté de Mortaigne
- Marriage: Helvide
- Died: 1079, Normandy 719
Noted events in his life were:
• Background Information: 411
Geoffroy, who had the titles of Vicomté de Châteaudun and Comté de Mortaigne. Alberic of Trois Fontaines, gave him the county of Perche. Geoffroy died about 1079 and was married to Adeline.
~A Genealogical History of the Family of Montgomery, p. 21
• Web Reference: Charles Cawley's Medieval Lands, Geoffrey de Châteaudun.
Geoffroy's parentage is confirmed by the charter dated to  under which "Rotrochus comes de Mauritania et mea uxor Adeliz et filii nostri Rotrochus et ceteri nostri infantes" donated property to Saint-Vincent du Mans, for the anniversary of "avi mei Fulcuich comitis et avunculi mei Hugonis et patris mei vicecomitis Gaufridi" [ Charles, R. and Menjot d´Elbenne (eds.) (1886) Cartulaire de l´abbaye de Saint-Vincent du Mans (Mamer, Le Mans) ("Le Mans Saint-Vincent"), Liber primus, 609, p. 350]. Geoffroy married Helvis.
Geoffrey married Helvide.