as it gave them an opportunity to reclaim their lost autonomy. In March 1152, Louis VII and Eleanor of Aquitaine had their marriage annulled under the pretext of consanguinity at the council of Beaugency. The terms of the annulment left Eleanor as duchess of Aquitaine but still a vassal of Louis. She left Beaugency for Poitiers, narrowly escaping an ambush by Henry's brother Geoffrey on route, and there, eight weeks later, she married Henry. Thus Henry became duke of Aquitaine and Gascony and count of Poitou. Louis responded with a furious attack on Normandy. In Anjou, Henry had refused to give the county to his brother, and thus a coalition of Henry's enemies was formed by Louis VII: Stephen of England and his son Eustace IV of Boulogne (married to Louis' sister); Henry I, Count of Champagne (betrothed to Louis' daughter), Robert of Dreux (Louis' brother) and Henry's brother, Geoffrey. In July 1152, Capetian troops attacked Aquitaine while Louis, Eustace, Henry of Champagne, and Robert attacked Normandy. Geoffrey raised a revolt in Anjou while Stephen attacked Angevin loyalists in England. Several Anglo-Norman nobles switched allegiance, sensing an impending disaster. Henry was about to sail for England to pursue his claim when his lands were attacked. He first reached Anjou and compelled Geoffrey to surrender. He then took the decision to sail for England in January 1153 to meet Stephen. Luckily enough, Louis fell ill and had to retire from the conflict while Henry's defences held against his enemies. After seven months of battles and politics, Henry failed to get rid of Stephen but then Stephen's son, Eustace, died in dubious circumstances, "struck by the wrath of god." Stephen gave up the struggle by ratifying the Treaty of Winchester, making Henry his heir on condition that the landed possessions of his family were guaranteed in England and France—the same terms Matilda had previously refused after her victory at Lincoln. Henry became King Henry II of England upon Stephen's death on 25 October 1154. Subsequently, the question was again raised of Henry's oath to cede Anjou to his brother Geoffrey. Henry received a dispensation from Pope Adrian IV under the pretext the oath had been forced upon him, and he proposed compensations to Geoffrey at Rouen in 1156. Geoffrey refused and returned to Anjou to rebel against his brother. Geoffrey may have had a strong claim, but his position was weak. Louis