Geoffrey also put down three baronial rebellions in Anjou, in 1129, 1135, and 1145–1151. He was often at odds with his younger brother, Elias, whom he had imprisoned until 1151. The threat of rebellion slowed his progress in Normandy, and is one reason he could not intervene in England. In 1153, the Treaty of Wallingford allowed Stephen should remain King of England for life and that Henry, the son of Geoffrey and Matilda should succeed him.