material for the earlier parts of his history. His introduction imitates the work of Orosius, and his title is an echo of Eusebius's Historia Ecclesiastica. Bede also followed Eusebius in taking the Acts of the Apostles as the model for the overall work: where Eusebius used the Acts as the theme for his description of the development of the church, Bede made it the model for his history of the Anglo-Saxon church. Bede quoted his sources at length in his narrative, as Eusebius had done. Bede also appears to have taken quotes directly from his correspondents at times. For example, he almost always uses the terms "Australes" and "Occidentales" for the South and West Saxons respectively, but in a passage in the first book he uses "Meridiani" and "Occidui" instead, as perhaps his informant had done. At the end of the work, Bede added a brief autobiographical note; this was an idea taken from Gregory of Tours' earlier History of the Franks. Bede's work as hagiographer, and his detailed attention to dating were both useful preparations for the task of writing the Historia Ecclesiastica. His interest in computus, the science of calculating the date of Easter, was also useful in the account he gives of the controversy between the British and Anglo-Saxon church over the correct method of obtaining the Easter date. Themes One of the important themes of the Historia Ecclesiastica is that the conversion of Britain to Christianity had all been the work of Irish and Italian missionaries, with no efforts made by the native Britons. This theme was developed from Gildas' work, which denounced the sins of the native rulers during the invasions, with the elaboration by Bede that the invasion and settlement of Britain by the Angles and Saxons was God's punishment for the lack of missionary effort and the refusal to accept the Roman date for celebrating Easter. Although Bede discusses the history of Christianity in Roman Britain, it is significant that he ignores the missionary work of St Patrick. He writes approvingly of Aidan and Columba, who came from Ireland as missionaries to the Picts and Northumbrians, but disapproved of the failure of the Welsh to evangelize the invading Anglo-Saxons. Bede was a partisan of Rome, regarding Gregory the Great, rather than Augustine, as the true apostle of the English. Likewise, in his treatment of the conversion of the invaders, any native involvement is