[1] Geoffrey succeeded his uncle Ralph I in 1015, continuing the war against William V of Poitiers and Hugues IV of Lusignan, and capturing the castle of Mouzeuil.
[2] After years of indecisive warfare, peace was sealed with the marriage of the daughter of Ralph I, Audéarde, with Hugh IV of Lusignan.
[4] Despite this hostility, Geoffrey allied with the son of Fulk Nerra, Geoffrey II of Anjou, and assisted him in his attempt to seize power in the County of Poitiers and the Duchy of Aquitaine.
They devastated the surroundings of Poitiers, while William VI, Duke of Aquitaine did the same in the Angevin regions of Loudun and Mirebeau.
[5] Geoffrey de Thouars became a monk at Saint-Michel-en-l'Herm just before dying in 1055.