Life Of St. Columba by Adomnan of Iona

A vivid hagiography that traces the life, missionary labors, and spiritual authority of an Irish monk who founded a monastery on a remote island; it recounts his role in converting local peoples and negotiating with kings, episodes of exile and conflict, and a stream of miraculous deeds—healings, visions, control over nature and demons—that illustrate his sanctity and leadership of the monastic community, presenting him as an exemplar of ascetic virtue whose death and posthumous wonders confirm his holy standing.

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