 The cathedral was badly damaged during Danish raids on Canterbury in 1011.The Archbishop, Ælfheah, was taken hostage by the raiders and eventually killed at Greenwich on 19 April 1012, the first of Canterbury's five martyred archbishops.After this a western apse was added as an oratory of Saint Mary, probably during the archbishopric of Lyfing (1013–1020) or Aethelnoth (1020–1038).