Geoffrey started by making his power base the of Angers. Geoffrey carefully placed his loyal followers on lands surrounding the city. This was to protect his own territories. The lands of the abbeys of Saint-Aubin and Saint-Serge in Angers provided revenues for his most faithful men. Geoffrey told both his sons, Fulk and Maurice: "No house is weak that has many friends. Therefore I you to hold dear those who have been friends." Geoffrey used several ways of expanding his power and control. Creating family connections was one way. For example his father had controlled Nantes by marrying the countess. Geoffrey brought Nantes under control by making Count Guerech accept him as overlord. For some time the counts of Maine and the bishops of Le Mans had been fighting among themselves. Geoffrey saw a way to take advantage of the situation. About 971 Geoffrey secured the diocese of Le Mans for his ally and friend Bishop Seinfroy. Then, in 973, Geoffrey arranged the marriage of his daughter Ermengarde-Gerberga to Conan I of Rennes, the count of Maine. But rather than act like an ally Conan began to oppose Geoffrey. In 982 the two met at the first battle of Conquereuil where Geoffrey defeated Conan. 