Dictionary of National Biography, 1885-1900/O'Brien, Terence (d.1460)
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O'BRIEN, TERENCE or TOIRDHELBHACH (d. 1460), bishop of Killaloe, second son of the lord of Thomond, was appointed bishop of Killaloe by papal provision, apparently in succession to James O'Ghonelan, or O'Conghalain, who held the see in 1441. He was treacherously slain at Ennis in 1460 by Brian-an-Chobhlaigh O'Brien (Brian of the Fleet), one of his own kinsmen.
[Ann. of the Four Masters, iv. 1005, ed. O'Donovan; Ware's Works, i. 594, ed. Harris; Cotton's Fasti Eccl. Hibern. i. 400.]