Synod of Whitby
The Northumbrian church, which began with Paulinus and Roman Christianity, was revived by Aidan, who introduced Celtic customs from Iona. The most controversial difference, the dating of Easter, was the main issue at Whitby.
Key Northumbrians representing the Celtic cause at Whitby were Abbess Hilda, Cedd, bishop to the East Saxons, and Bishop Colman of Lindisfarne. Wilfrid was spokesman for the visiting Frankish bishop Agilbert from Wessex, and his priest Agatho, main advocates for Rome. King Oswiu's decision to conform with the greater body of Roman Christianity may have been politically expedient. The synod prepared the way for unification of the English church by Theodore, next archbishop of Canterbury.