Early Insular Christianity
- Celtic Christianity (5th to 8th centuries), the Christianity surviving from the Roman period in the Celtic areas of Britain and Ireland (e.g. Ireland, Wales, Scotland) and spread to parts of Anglo-Saxon England by the Hiberno-Scottish mission
- Anglo-Saxon Christianity (7th to 11th centuries), the Christianity imported from Rome by Augustine of Canterbury in 597
The Synod of Whitby of 664 forms a significant watershed in that King Oswiu of Northumbria decided to follow Roman rather than Celtic practices, but the two rites co-existed for another century, Wales observing the Celtic Easter date until 768. The Anglo-Saxon mission in the 7th to 8th centuries spread Christianity to the Continent, as had the earlier Celtic missions.
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