Columba and Kentigern.
After establishing 30 houses of prayer in Ireland, and after making a pilgrimage to honor Martin at Tours, the hot-headed Columba created some serious problems in Ireland—and was banished from his homeland in the middle of the sixth century. Founding the prayer community at Iona, Columba succeeded in bringing the Picts and Scots of Scotland to Christ. The Welshman Kentigern established the house of prayer that came to be Glasgow, and these two men demonstrated the passion for unity in the Celtic Church by exchanging bishops’ staffs. Both Iona and Glasgow demonstrated a passion for cross-cultural evangelism.