Theodore set about organizing the Church throughout England. Many of the sees had no bishops when he first arrived, and others sees needed to be divided. In 672 he called the first general synod of the bishops of the English Church to settle many important questions about the discipline and life of the Church in England.
Theodore's greatest achievement was to adapt the Roman ideal of a centralized church to English conditions. His establishment of a centralized church under the archbishopric of Canterbury in close alliance with secular rulers was maintained by his successors.
Theodore and Adrian brought organization and education to the English Church, and what they established there continue on to this day within the Ordinariates, which follow many of the traditions they began.
O God, whose Bishop Theodore was called to England to set the Church on a firm foundation: by his prayers, build us always anew on the rock that is Christ; and keep thy household faithful to the call we have received; through Jesus Christ thy Son our Lord, who liveth and reigneth with thee, in the unity of the Holy Spirit, ever one God, world without end. Amen.