Edward's reign, at Kirtlington in Oxfordshire after Easter 977, and again at Calne in Wiltshire the following year. During the meeting at Calne, some councillors were killed and others injured by the collapse of the floor of their room. Death The version of the Anglo-Saxon Chronicle containing the most detailed account records that Edward was murdered in the evening of 18 March 978, while visiting Ælfthryth and Æthelred, probably at or near the mound on which the ruins of Corfe Castle now stand. It adds that he was buried at Wareham "without any royal honours". The compiler of this version of the Chronicle, manuscript E, called the Peterborough Chronicle, says: "No worse deed for the English race was done than this was, since they first sought out the land of Britain. Men murdered him, but God exalted him. In life he was an earthly king; after death he is now a heavenly saint. His earthly relatives would not avenge him, but his Heavenly Father has much avenged him." Other recensions of the Chronicle report less detail, the oldest text stating only that he was killed, while versions from the 1040s say that he was martyred. Of other early sources, the life of Oswald of Worcester, attributed to Byrhtferth of Ramsey, adds that Edward was killed by Æthelred's advisers, who attacked him when he was dismounting. It agrees that he was buried without ceremony at Wareham. Archbishop Wulfstan II alludes to the killing of Edward in his Sermo Lupi ad Anglos, written not later than 1016. A recent study translates his words as follows: "And a very great betrayal of a lord it is also in the world, that a man betray his lord to death, or drive him living from the land, and both have come to pass in this land: Edward was betrayed, and then killed, and after that burned ..." Later sources, further removed from events, such as the late 11th-century Passio S. Eadwardi and John of Worcester, claim that Ælfthryth organised the killing of Edward, while Henry of Huntingdon wrote that she killed Edward herself. Modern historians have offered a variety of interpretations of Edward's killing. Three main theories have been proposed. Firstly, that Edward was killed, as the life of Oswald claims, by nobles in Æthelred's service, either as a result of a personal quarrel, or to place their master on the throne. The life of