His Life and Miracles by Adomnán of Iona

"His Life and Miracles" by Adomnán is a detailed biography of Saint Columba, a 6th-century Irish monk and missionary. It explores his origins, spiritual journey, and influence in spreading Christianity across Ireland and Scotland. The work highlights numerous miracles attributed to Columba, such as healings and divine interventions, illustrating his holiness and divine favor. It also provides insights into the religious and cultural context of early medieval Ireland, emphasizing Columba's role as a spiritual leader and his enduring legacy in Christian history. The text is both hagiography and a record of his impact on Christianity's expansion.