The Angevins ("from Anjou") were an English royal house in the 12th and early 13th centuries; its monarchs were Henry II, Richard I and John. In the 10 years from 1144, two successive counts of Anjou, Geoffrey and his son, the future Henry II, won control of a vast assemblage of lands in western Europe that would last for 80 years and would retrospectively be referred to as the Angevin Empire. As a political entity this was structurally different from the preceding Norman and subsequent Plantagenet realms. Geoffrey became Duke of Normandy in 1144 and died in 1151. In 1152 his heir, Henry, added Aquitaine by virtue of his marriage to Eleanor of Aquitaine. Henry also inherited the claim of his mother, Empress Matilda, the daughter of King Henry I, to the English throne, to which he succeeded in 1154 following the death of King Stephen.