Geoffrey vicomte de Château-du-Loire
- Marriage: Helvise dame de Mondoubleau
- Died: 12 Apr 1140-1145, Charters
 Noted events in his life were:
• Web Reference: Charles Cawley's Medieval Lands, Geoffroy III de Châteaudun.
Geoffroy de Châteaudun was the son of Hugues vicomte de Châteaudun and Agnes comtesse de Fréteval. "Hugo vicecomes de Castroduno" donated the church of Saint-Léonard de Bellême to Marmoutier, with the consent of "Gausfredo comite fratre eius, Roberto Mandaguerran fratre eius, Comitissa uxore eius, Gausfredo filio eius, Matilde filia eius", by charter dated to (1092/1100) [Marmoutier-Perche, 16, p. 28]. Geoffrey became the vicomte de Châteaudun by 1110/11. Geoffrey was married to Helvise dame de Mondoubleau. "Gaufrido vicecomite, Helvisa uxore eius, Hugone filio eius, Alpez et Helvisa filiabus eius…" witnessed an undated charter which records a donation by "Arnulfus de Semblentiaco" to the church of Saint-Vincent du Mans [Le Mans Saint-Vincent, Liber primus, 197, p. 124].
Geoffrey married Helvise dame de Mondoubleau, daughter of Ilbert de Fréteval and Unknown. (Helvise dame de Mondoubleau died in 1154.)
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