Aidan (600-651 A.D.) became one of the Irish Celtic Monks on the Holy Island of Iona (630 A.D.) in Scotland, where The Book of Kells was made. Iona had been founded in 565 A.D. by Columcille (Columba: 521-597 A.D.), who was the missionary Irish Celtic Monk who converted the pagan Picts of northwestern Scotland to Christianity.
Aidan was sent as missionary to the Angles (we get our word "English" from the word: "Angle-ish") after an earlier missionary monk named Corman had given up, saying that they were too uncivilized and stubborn to be Christianized. In 635 A.D. Aidan founded the monastery on the Holy Island of Lindisfarne. From here he preached to and brought to Christ the Angles of Northumbria ...