 Intercourse with Ireland was considerable and the few details that can be gathered from such sources as Adamnan's Life of St. Columba and the various relics of the Scoto-Northumbrian Church point to a general similarity with Ireland in the earlier period.Of the rite of the monastic order of the Culdees (Céli Dé or Goillidhe-Dé, servants of God, or possibly Cultores Dei) very little is known, but they certainly had a rite of their own, which may have been similar to the Irish.The Roman Easter and tonsure were adopted by the Picts in 710, and at Iona in 716-18, and much later, in about 1080, St. Margaret of Scotland, wife of King Malcolm III, wishing to reform the Scottish church in a Roman direction, discovered and abolished certain peculiar customs of which Theodoric, her chaplain and biographer, tells us less than we could wish.