Soon after Saint Columba established his residence in Iona, tradition says that he paid a visit to a great seminary of Druids, then in the vicinity, at a place called Camusnan Ceul, or Bay of Cells, in the district of Ardnamurchan. Several remains of Druidical circles are still to be seen there, and on that bay and the neighbourhood many places are still named after their rites and ceremonies; such as Ardintibert, the Mount of Sacrifice, and others. The fame of the Saint had been for some time well known to the people, and his intention of instructing them in the doctrines of Christianity was announced to them. The ancient priesthood made every exertion to dissuade the inhabitants from hearing the powerful eloquence of Columba, and in this they were seconded by the principal man then in that country, whose name was Donald, a son of Connal.
The Saint had no sooner made his appearance, however, than he was surrounded by a vast multitude, anxious to hear so celebrated a preacher; and after the sermon was ended, many persons expressed a desire to be baptized, in spite of the remonstrances of the Druids. Columba had made choice of an eminence centrally situated for performing worship; but there was no water near the spot, and the son of Connal threatened with punishment any who should dare to procure it for his purpose. The Saint stood with his back leaning on a rock; after a short prayer, he struck the rock with his foot, and a stream of water issued forth in great abundance. The miracle had a powerful effect on the minds of his hearers, and many became converts to the new religion. This fountain is still distinguished by the name of Columba, and is considered of superior efficacy in the cure of diseases. When the Catholic form of worship prevailed in that country it was greatly resorted to, and old persons yet remember to have seen offerings left at the fountain in gratitude for benefits received from the benignant influence of the Saint’s blessing on the water.