He was so intractable in spirit, and so cruel, that he put out the eyes of large numbers who were not subservient to his will.
From all the concurrent evidences which can be gleaned, it appears that Madoc was the commander of his father's fleet, which at that time was so considerable as successfully to oppose that of England at the mouth of the Menai in the year 1142. The poem in which Gwalchmai has celebrated this victory has already been given in this chapter. There is also an allusion to it in Caradoc's History, p. 163, 4th ed., 1607.
Madoc was of a mild, gentle temperament, and must have felt deeply grieved at the unnatural dissensions existing between his own brothers. Moreover, he was an object of suspicion himself, exposed to his brother Davydd's ferocity, who imagined that he might also dispute the question of succession to the throne. Doubtless it was this that led Madoc to resolve that he would leave those scenes of contention, and seek, in exile from his native country, some other land in the west, if such could be found. Being commander-in-chief of the fleet, he was able to take a speedy departure.
This emigration of Prince Madoc seems to have been commemorated by Bards who lived very near the time in which it took place. According to various old documents, his enterprise of exploring the ocean westward resulted in the discovery of a new world, from which he returned to make known his good fortune and to gather other emigrants to accompany him thither. He accordingly fitted out a second expedition, and, taking his brother Riryd, Lord of Clocran in Ireland, with him, they prevailed upon a number to accompany them, sufficient to fill ten ships. They set sail from a small port, five miles from Holyhead, in the island of Anglesea.
There is a large book of pedigrees still extant, written by Jeuan Brecva, who flourished in the age preceding the time of Columbus, where the above event is thus noticed in treating of the genealogy of Owain Gwynedd: "Madoc and Riryd found land far in the sea of the west, and there they settled."
The Bards were the historians of those times. By a perusal of the compositions of those who were contemporary with Madoc, it is found that his name is mentioned three or four times by Cynddelw, Llywarch, and Gwalchmai. These are held to be among the most celebrated of the Welsh Bards. Their works, which are mostly extant in manuscript, would each of them make a respectable volume.