Canterbury, taking Swithun's head with him as a relic for the new location. He went to Rome in 1007 to receive his pallium—symbol of his status as an archbishop—from Pope John XVIII, but was robbed during his journey. While at Canterbury, he promoted the cult of Dunstan, ordering the writing of the second Life of Dunstan, which Adelard of Ghent composed between 1006 and 1011. He also introduced new practices into the liturgy, and was instrumental in the Witenagemot's recognition of Wulfsige of Sherborne as a saint in about 1012. Ælfheah sent Ælfric of Eynsham to Cerne Abbey to take charge of its monastic school. He was present at the council of May 1008 at which Wulfstan II, Archbishop of York, preached his Sermo Lupi ad Anglos (The Sermon of the Wolf to the English), castigating the English for their moral failings and blaming the latter for the tribulations afflicting the country. In 1011, the Danes again raided England, and from 8–29 September they laid siege to Canterbury. Aided by the treachery of Ælfmaer, whose life Ælfheah had once saved, the raiders succeeded in sacking the city. Ælfheah was taken prisoner and held captive for seven months. Godwine (Bishop of Rochester), Leofrun (abbess of St Mildrith's), and the king's reeve, Ælfweard were captured also, but the abbot of St Augustine's Abbey, Ælfmær, managed to escape. Canterbury Cathedral was plundered and burned by the Danes following Ælfheah's capture. Death Ælfheah refused to allow a ransom to be paid for his freedom, and as a result was killed on 19 April 1012 at Greenwich, reputedly on the site of St Alfege's Church. The account of Ælfheah's death appears in the E version of the Anglo-Saxon Chronicle: Ælfheah was the first Archbishop of Canterbury to die a violent death. A contemporary report tells that Thorkell the Tall attempted to save Ælfheah from the mob about to kill him by offering everything he owned except for his ship, in exchange for Ælfheah's life; Thorkell's presence is not mentioned in the Anglo-Saxon Chronicle, however. Some sources record that the final blow, with the back of an axe, was delivered as an act of kindness by a Christian convert known as "Thrum." Ælfheah was buried in Old St Paul's Cathedral. In 1023, his body was moved by King Cnut to Canterbury, with great ceremony. Thorkell the Tall was appalled at the brutality of his fellow raiders,