The History of the English Church and People has a clear polemical and didactic purpose. Bede sets out, not just to tell the story of the English, but to advance his views on politics and religion. In political terms he is a partisan of his native Northumbria, amplifying its role in English history over and above that of Mercia, its great southern rival. While Bede is loyal to Northumbria, he shows an even greater attachment to the Irish and the Irish Celtic missionaries, whom he considers to be far more effective and dedicated than their rather complacent English counterparts. His final preoccupation is over the precise date of Easter, which he writes about at length. It is here, and only here, that he ventures some criticism of St Cuthbert and the Irish missionaries, who celebrated the event, according to Bede, at the wrong time. In the end he is pleased to note that the Irish Church was saved from error by accepting the correct date for Easter