Geoffrey V (24 August 1113 - 17 September 1151), called the Handsome (French: le Bel) and Plantagenet, was the Count of Anjou, Touraine, and Maine by inheritance from 1129 and then Duke of Normandy by conquest from 1144. By his marriage to the Empress Matilda, daughter and heiress of Henry I of England, Geoffrey had a son, Henry Curtmantle, who succeeded to the English throne and founded the Plantagenet dynasty to which Geoffrey gave his nickname.
On 17 June 1128 Geoffrey married Empress Matilda, the daughter and heiress of King Henry I of England by his first wife Edith of Scotland, and widow of Henry V, Holy Roman Emperor. (There is another date for this marriage of 22 May 1127 Le Mans, Sarthe, France) The marriage was meant to seal a peace between England/Normandy and Anjou. She was eleven years older than Geoffrey, very proud of her status as an Empress (as opposed to being a mere Countess). Their marriage was a stormy one with frequent long separations, but she bore him three sons and survived him. Geoffrey died suddenly on 7 September 1151. According to John of Marmoutier, Geoffrey was returning from a royal council when he was stricken with fever. He arrived at Château-du-Loir, collapsed on a couch, made bequests of gifts and charities, and died. He was buried at St. Julien's Cathedral in Le Mans France.
Jim Bradbury, "Geoffrey V of Anjou, Count and Knight", in The Ideals and Practice of Medieval Knighthood III
Charles H. Haskins, "Normandy Under Geoffrey Plantagenet", The English Historical Review, volume 27 (July 1912), pp. 417-444