[1][2] Both he and his younger brother Fulk, called le Réchin, were taken under the wing of their uncle, Geoffrey Martel and both were knighted by him in 1060.
[3] Geoffrey III would serve as Count of Anjou until the Countship was taken from him by his brother, Fulk.
[b][6] In 1065 Geoffrey alienated Archbishop Barthelemy by trying to force his own choice for Bishop of Le Mans on the church.
[7] As the situation in Anjou deteriorated Fulk IV quarreled with his brother Geoffrey.
[1][10] Geoffrey and Fulk's sister, Hildegarde married Joscelin I, Lord of Courtenay and had issue.