664 Synod of Whitby

The Synod of Whitby was a seventh-century Northumbrian synod where King Oswiu of Northumbria ruled that his kingdom would calculate Easter and observe the monastic tonsure according to the customs of Rome, rather than the customs practised by Iona and its satellite institutions. The synod was summoned in 664 at Saint Hilda's double monastery of Streonshalh (Streanæshalch), later called Whitby Abbey. The Synod of Whitby established Roman practice as the norm in Northumbria, and thus "brought the Northumbrian church into the mainstream of Roman culture." The episcopal seat of Northumbria was transferred from Lindisfarne to York.