The Synod of Whitby

Northumbria in 664 had two Christian traditions in one kingdom. The north had been converted from Iona, in the Irish tradition, and used an older method of calculating Easter and a different form of the monastic tonsure. The south looked to Canterbury and the Roman practice. King Oswiu followed the Ionan reckoning and his queen the Roman, with the result that in some years the court celebrated Easter while the queen's household was still keeping Lent.

The synod met at the double monastery of Streanaeshalch, ruled by the abbess Hilda, who belonged to the Ionan tradition and hosted the assembly that decided against it. Colman of Lindisfarne argued for the custom of Columba; Wilfrid argued for the practice of Rome and the wider church. The king, by Bede's account, asked whether both sides agreed that Peter held the keys of the kingdom, and on being told they did, ruled for the tradition that claimed Peter's authority.

The immediate matter was calendrical, but the decision aligned the Northumbrian church with Rome and with the Latin West rather than with the Irish mission that had converted it. Colman resigned his see and withdrew with those who would not conform, first to Iona and then to Ireland. The Ionan reckoning persisted elsewhere for decades and Iona itself conformed in the eighth century.

Nearly everything anyone knows about this synod comes from a single chapter of Bede's Ecclesiastical History, written some sixty years afterwards by a monk of Wearmouth and Jarrow who was firmly committed to the Roman side. There are no acts, no letters from participants and no independent account. The speeches Bede gives to Colman and Wilfrid are compositions in the manner of ancient historians, and the exchange about the keys of the kingdom is the kind of decisive closing line that historians of every period have supplied to their heroes.

This does not make the synod fictional. That a meeting took place, that Oswiu decided for the Roman Easter and that Colman withdrew are supported by the general course of events. What is uncertain is the drama: how the arguments actually ran, how close the decision was, and whether the participants understood it as the epochal choice between two Christian worlds that Bede presents.

Later writing made it more epochal still. The synod has often been described as the moment a Celtic church was absorbed by a Roman one, a framing that assumes two organised bodies where there were differences of custom within one communion. Historians of early medieval Britain have been dismantling that picture for decades. The atlas records the synod as a real decision about Easter and the tonsure, and flags the larger story built on top of it as the work of later interpreters.