Historical treatment of David I and the Scottish church usually emphasises King David I of Scotland's pioneering role as the instrument of diocesan reorganisation and Norman penetration, beginning with the bishopric of Glasgow while David was Prince of the Cumbrians, and continuing further north after David acceded to the throne of Scotland. As well as this and his monastic patronage, focus too is usually given to his role as the defender of the Scottish church's independence from claims of overlordship by the Archbishop of York and the Archbishop of Canterbury.