estimate that 2,000 invaders died along with about twice that number of Englishmen. William founded a monastery at the site of the battle, the high altar of the abbey church supposedly placed at the spot where Harold died. Background In 911, the Carolingian ruler Charles the Simple allowed a group of Vikings to settle in Normandy under their leader Rollo. Their settlement proved successful, and they quickly adapted to the indigenous culture, renouncing paganism, converting to Christianity, and intermarrying with the local population. Over time, the frontiers of the duchy expanded to the west. In 1002, King Æthelred II married Emma, the sister of Richard II, Duke of Normandy. Their son Edward the Confessor spent many years in exile in Normandy, and succeeded to the English throne in 1042. This led to the establishment of a powerful Norman interest in English politics, as Edward drew heavily on his former hosts for support, bringing in Norman courtiers, soldiers, and clerics and appointing them to positions of power, particularly in the Church. Edward was childless and embroiled in conflict with the formidable Godwin, Earl of Wessex, and his sons, and he may also have encouraged Duke William of Normandy's ambitions for the English throne. Succession crisis in England King Edward's death on 5 January 1066 left no clear heir, and several contenders laid claim to the throne of England. Edward's immediate successor was the Earl of Wessex, Harold Godwinson, the richest and most powerful of the English aristocrats and son of Godwin, Edward's earlier opponent. Harold was elected king by the Witenagemot of England and crowned by Ealdred, the Archbishop of York, although Norman propaganda claimed that the ceremony was performed by Stigand, the uncanonically elected Archbishop of Canterbury. Harold was at once challenged by two powerful neighbouring rulers. Duke William claimed that he had been promised the throne by King Edward and that Harold had sworn agreement to this. Harald Hardrada of Norway also contested the succession. His claim to the throne was based on an agreement between his predecessor Magnus the Good and the earlier King of England Harthacnut, whereby, if either died without heir, the other would inherit both England and Norway. William and Harald Hardrada immediately set about assembling troops and ships for separate invasions. Tostig and Hardrada's invasions In early 1066, Harold's exiled brother Tostig Godwinson raided southeastern England with a fleet he had recruited in Flanders,