DIED A. D. 1333.
From The Irish Nation: Its History and Its Biography
By James and Freeman Wills
MORTOUGH O'BRIEN, in common with every person of the name who finds a place in our pages, was descended from the hero of Clontarf, and was inaugurated king of Thomond in 1311. After undergoing many perilous vicissitudes in the party wars of his own family, he was obliged to fly, in 1314, from Thomond. He found a refuge in Connaught with the Burkes and Kellys, by whom he was humanely received and hospitably entertained. After undergoing some further troubles and reverses, he at last succeeded, in 1315, in fixing himself in the secure possession of his provincial territories. In 1316, he was chosen by the English of Munster to lead them against Bruce, and at their head he obtained some partial victories, which won him honour, and contributed both to protect Munster and weaken the Scotch. He enjoyed his sovereignty in peace till 1333, the year of his death.