Geoffrey VI, Viscount of Châteaudun
Geoffrey VI (Goeffroy VI) (died 6 February 1250) was a Viscount of Châteaudun. He was the son of Geoffrey V, Viscount of Châteaudun, and Adelicia de Nevers. Although Adelicia's ancestry is not precisely known, she is likely the daughter of William IV, Count of Nevers, and Eléonore, Countess of Vermandois.
Geoffrey married twice, and produced two famous daughters. His first wife was Mabile, of unknown ancestry. Geoffrey and Mabile had three children: Pierre (d. after 1251), a monk at an unknown abbey, Isabelle and Odette.
Geoffrey was succeeded by his daughter Clemence who became Viscountess of Châteaudun.
Clemence married Robert de Dreux, Seigneur de Beau, son of Robert III “Gasteblé”, Count of Dreux, great-grandson of Louis VI the Fat, King of France. Clemence’s husband became the last Viscount of Châteaudun. Jeanne married first John I, Count of Montfort, and second, Jean de Brienne, Grand Butler of France, son of John of Brienne, King of Jerusalem and Emperor of Constantinople, and Berenguela of León.
- Akropolites, George (translated by Ruth Mackrides), The History, Oxford University Press, 2007
- Settipani, Christian, Les vicomtes de Châteaudun et leurs alliés, dans Onomastique et Parenté dans l'Occident médiéval, Oxford, Linacre, Unit for Prosopographical Research, 2000
- Europäische Stammtafeln, Vol. III, Les Vicomtes de Châteaudun
- Medieval Lands Project, Vicomtes de Châteaudun