Adomnán is the only individual person in the nine centuries of Scotland’s history covered by this book for whom we have enough evidence to form a picture of a real human being, through his writings, the writings of his monastery, and writings about him. We can identify key moments in his life, and examine his writings (the Life of Columba, a book On the Holy Places, a law for the protection of women, children and clergy (non-combatants) called Cáin Addomnáin or Lex Innocentium, some minor canons or rules, and a short poem. His years as abbot of Iona also suggest that we should take other texts associated with Iona during his abbacy as indicative of Iona’s intellectual culture and ideology. Among these concerns are the protection of the vulnerable, the promotion of a new ideology of kingship, the place of Iona in hierarchies of ecclesiastical authority, the promotion of monastic life and scholarship, the resolution of the Easter dating dispute, the understanding of the liturgy.