The Most Ancient Lives of Saint Patrick/The Life and Acts of St. Patrick/Chapter 53
Of the Prophecy of St. Patrick on Coyrbre, and of the Unfruitfulness of a River.
And Leogaire had two brothers, the elder of whom was named Coyrbre, like unto him in cruelty and unbelief, if, indeed, any one could in that country be found like him, who contemned and condemned the law of the Most High; and the younger was named Conallus, who retained no more of his birth than does the fish of the sea or the rose of the thorn. But Patrick having gone to Coyrbre, who then abided in the place called Tailltion, that he might convert him unto the Christian faith, if in any wise from that stone could a son be raised up unto Abraham, yet he, his heart being hardened against belief, intended the death of the preacher who would have preached life unto him, and even in the middle of the river he scourged the servants of Patrick; and the saint, knowing him to be obstinate in his error, and to be abandoned of God, thus prophesied unto him: "Since thou hast refused to bear the yoke of Christ, whose service is freedom, no one of thy posterity shall attain the throne of thy kingdom, but in perpetual servitude shall they serve the seed of thy younger brother, Conallus. And this shall be to thee a sign that the Lord will fulfil the word which He has spoken through my mouth: the river near thy mansion, which, with the abundance of its fishes, is wont to feed thee and thine household, from henceforward, even for ever, shall produce no fishes." And the word of the man of God obtained, for all his posterity became subject unto the posterity of his brother Conallus, and they came unto the throne of his kingdom; and the river, which is called Seyle, even to this day beareth no fishes.