sentences:  Whatever Oswiu's motivations at Whitby, the move may have been politically expedient, as the Iona-oriented Columban churches and clerics (who were mostly Irish) were now replaced by Northumbria's Anglo-Saxon, York-oriented churches and clerics.However, the authority of the Bishop of York was diluted by Theodore, the Archbishop of Canterbury, who created several bishoprics out of Northumbrian territory, with the intent that they be subordinate to Canterbury rather than to York.York resisted and was ultimately equal to the challenge, as the bishopric was elevated to an archbishopric by the Pope in 735 and was able to oversee its own subordinate bishoprics.