defeat, not at Hastings, but at Berkhamsted two months later when Edgar and his supporters submitted to William in December 1066. However, of all the men who submitted to William at Berkhamsted it was only Ealdred, Archbishop of York, who would remain loyal to the Norman king. William faced a series of rebellions and border skirmishes in Dover, Exeter, Hereford, Nottingham, Durham, York and Peterborough. Copsi, a supporter of Tostig (a previous Anglo-Saxon earl of Northumbria who had been banished by Edward the Confessor), was a native of Northumbria and his family had a history of being rulers of Bernicia, and at times Northumbria. Copsi had fought in Harald Hardrada's army with Tostig, against Harold Godwinson at the Battle of Stamford Bridge in 1066. He had managed to escape after Harald's defeat. When Copsi offered homage to William at Barking in 1067, William rewarded him by making him earl of Northumbria. After just five weeks as earl, Copsi was murdered by Osulf, son of Earl Eadulf III of Bernicia. When, in turn, the usurping Osulf was also killed, his cousin, Cospatrick, bought the earldom from William. He was not long in power before he joined Edgar Ætheling in rebellion against William in 1068. With two earls murdered and one changing sides, William decided to intervene personally in Northumbria. He marched north and arrived in York during the summer of 1068. The opposition melted away, with some of them – including Edgar – taking refuge at the court of the Scottish king Malcolm III. Back in Northumbria, William changed tactics and appointed a Norman, Robert de Comines, as earl, rather than an Anglo-Saxon. Despite warnings from the bishop, Ethelwin, that a rebel army was mobilised against him, Robert rode into Durham with a party of men on 28 January 1069, where he and his men were surrounded and slaughtered The rebels then turned their attention to York where they killed the guardian of the castle there plus a large number of his men William's response was swift and brutal: he returned to York, where he fell on the besiegers, killing or putting them to flight. Possibly emboldened by the fighting in the north, rebellions broke out in other parts of the country. William sent earls to deal with problems in Dorset, Shrewsbury and Devon, while he dealt with rebels in the Midlands and Stafford. Edgar Ætheling had sought assistance from the