Most of the information we have about Columba's life comes from Adomnan's "Life of Columba". Adomnan was the Abbot of Iona and, it is believed, he wrote this work in about 690 AD - nearly a century after Columba's death. The other major source of information about him is Bede, who wrote about forty years after Adomnan. In turn, oral tradition among the monks of Iona was a major source of their information, and it is also believed that Adomnan had access to an earlier "Life of Columba" written by his predecessor. St. Columba of Iona