St. Columba left Ireland for Iona due to a series of incidents that culminated in a bloody victory and his excommunication by a national convention of Irish clergy. Although the excommunication was later withdrawn, he was advised by a confessor to leave Ireland permanently. He chose Iona as his new mission field, where he could continue his work among the Scots.

St. Columba's departure from Ireland was precipitated by several incidents that showcased him at his worst, leading to a violent conflict in which his side emerged victorious. This resulted in his excommunication by a national convention of Irish clergy, though the sentence was later revoked. Despite this, a saintly confessor advised him to leave Ireland forever. On the day of Pentecost in 563, Columba, along with twelve disciples, landed on Iona. His move to Iona was not only a response to his need to leave Ireland but also a strategic choice, as he aimed to support his Scotic brethren in Dalriada and counter the Pictish king's recent advances. Columba's influence in Iona was significant both in religious and political terms, as he worked to strengthen the Church and the position of the Scots in the region.

Key points

Columba left Ireland due to incidents leading to his excommunication.
Excommunication was later withdrawn, but he was advised to leave permanently.
He chose Iona to continue his missionary work among the Scots.
His move was partly strategic, responding to political events in Dalriada.
Columba's work in Iona was significant both religiously and politically.

What were the circumstances that led St. Columba to leave Ireland for Iona?

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