The Scottish bishopric of Lindisfarne coincided with Bernicia.

Theodore divided these great dioceses into smaller ones; East Anglia had two, for its north and south folk, at Elmham and Dunwich; Bernicia was divided between Lindisfarne and Hexham; Lincolnshire had its see placed at Sidnacester; and the sub-kingdoms of Mercia were also made into dioceses, the Huiccii having their bishop-stool at Worcester; the Hecans, at Hereford; and the Middle English, at Leicester.

But Theodore's great work was the establishment of the national synod, in which all the clergy of the various English kingdoms met together as a single people.

This was the first step ever taken towards the unification of England; and the ecclesiastical unity thus preceded and paved the way for the political unity which was to follow it.

Theodore's organisation brought the whole Church into connection with Rome.