The Most Ancient Lives of Saint Patrick/The Life and Acts of St. Patrick/Chapter 89
Saint Patrick Prophesieth of the Sanctity of Saint Columba.
A certain prince named Conallus sought and obtained a blessing from the saint. And with the like purpose came also his younger brother, Fergus, who was one of the most powerful chiefs of the country. And him, the holy prelate, having prayed, blessed, and laid his hand upon his head with much solemnity and with peculiar devotion. But Conallus, who was elder in birth and in dominion, seeing that the saint had blessed his brother more earnestly and more devoutly than himself, wondered and grieved mightily. Therefore Patrick, observing his face unusually clouded, explained the cause of this so solemn benediction, and, prophesying, said unto him: "I have blessed thy brother Fergus for the sake of the blessed child that will be born of his race. For his son Fedhleminus will beget a son who will be called Columba—a name well fitted to his birth, since even in his mother's womb will he be filled with the Holy Spirit. Forasmuch as he will be enriched with the treasures of the divine wisdom and grace, rightly will he be called the bright and shining lamp of his generation, and the prophet of the Most Highest; and from the time that he cometh to the age of understanding never shall a purposed falsehood issue from his lips." How truly was this prophecy made of Saint Columba, who is called Coluimcille, and was the founder of an hundred monasteries, he who would more fully know, let him read the volume that has been written of the saint's life.