The Life of Saint Columba Kindle edition by St. Adomnan
Prophecy of St. Columba regarding the Sons of King Aidan. At another time, before the above-mentioned battle, the saint asked King Aidan about his successor to the crown. The king answered that of his three sons, Artur, Eochoid Find, and Domingart, he knew not which would have the kingdom after him. Then at once the saint prophesied on this wise, “None of these three shall be king, for they shall fall in battle, slain by their enemies; but now if thou hast any younger sons, let them come to me, and that one of them whom the Lord has chosen to be king will at once rush into my lap.” When they were called in, Eochoid Buide, according to the word of the saint, advanced and rested in his bosom. Immediately the saint kissed him, and, giving him his blessing, said to his father, “This one: shall survive and reign as king after thee, and his sons shall reign after him.” And so were all these things fully accomplished afterwards in their time. For Artur and Eochoid Find were not long after killed in the above-mentioned battle of the Miathi; Domingart was also defeated and slain in battle in Saxonia; while Eochoid Buide succeeded his father on the throne.
Of Domnall, son of Aid.
Domnall, son of Aid, while yet a boy, was brought by those who brought him up to St. Columba on the ridge of Ceatt (Druim Ceatt in Londonderry), who looked at him and inquired, “Whose son is this whom you have brought here?” They answered, “This is Domnall, son of Aid, who is brought to thee for this purpose, that he may return enriched by thy blessing.” The saint blessed him immediately and said. “He shall survive all his brethren, and be a very famous king, nor shall he be ever delivered into the hands of his enemies; but in his old age, in his own house, and with a crowd of his familiar friends around him, he hall die peacefully in his bed.” All this was truly fulfilled in him, as the blessed man had foretold. (p. 7)