Toirdhealbhach Ó Briain (some sources Terence)"Fasti ecclesiæ hibernicæ: the succession of the prelates in Ireland" Cotton, H. Vol1 p463: Dublin, Hodges & Smith, 1851 (died 1569), stylised in English as Turlough O'Brien, was a bishop in Ireland during the second half of the sixteenth century."A New History of Ireland" T. W. Moody, F. X. Martin, F.J. Byrne and Cosgrove, A: Oxford, OUP, 1976
Ó Briain was appointed Bishop of Killaloe on 25 June 1554 when they were temporarily reunited under Queen Mary I: in a letter of 12 October 1561, the papal legate Fr David Wolfe SJ described all the bishops in Munster as 'adherents of the Queen';
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