The Most Ancient Lives of Saint Patrick/The Life and Acts of St. Patrick/Chapter 55
Of the Altar of Saint Patrick.
And it was near to the heart of the saint to visit Connactia; and chiefly for the vision which he had heretofore beheld in his sleep, wherein he was called by the infants of that country, even in their mothers' wombs, he desired there to evangelize the kingdom of God. And he purposed to travel round the whole island, that he might convert it unto Christ; and the saint, being prepared to his journey, blessed Conallus, and in memorial of himself he left in the aforementioned city his altar of stone, for the relieving of the sick and for the working of miracles; but when he proceeded on his journey, the altar followed, nor to the eyes of any man was it visible how it was carried; but, as I account, it was carried along the path of the saint by the power and the virtue of Him at whose nod the prophet was carried from Judea into Chaldea. Thus did the Corner-Stone, Christ, that He might show unto all the holiness of Patrick, cause this holy stone to be moved without human hand. And the prelate, looking back, beheld the altar thus marvellously borne after him, and exulted in the Lord, and returned, and placed it in a fitting place. And from that day did it remain fixed, yet ceased it not to shine in miracles, as if the virtue of Patrick had remained in it or flowed from it.