 It was mainly spread by missionaries from Ireland from the 5th century and is associated with St Ninian, St Kentigern, and St Columba.The Christianity that developed in Ireland and Scotland differed from that led by Rome, particularly over the method of calculating Easter and the form of tonsure, until the Celtic church accepted Roman practices in the mid-7th century.Christianity in Scotland was strongly influenced by monasticism, with abbots being more significant than bishops.