Terence Albert O'Brien was an Irish priest of the Dominican Order and Roman Catholic Bishop of Emly. During the Cromwellian conquest of Ireland, he was captured by the New Model Army following the Siege of Limerick. After a drumhead court-martial, he was hanged by order of General Henry Ireton at Gallows Green, officially for advising against the surrender of the city, but in reality as part of the religious persecution of the Catholic Church in Ireland that began under Henry VIII and ended only with Catholic Emancipation in 1829. Bishop O'Brien was beatified as one of 17 Irish Catholic Martyrs by Pope John Paul II on 27 September 1992.

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c. 1600

30 October 1651

beatified

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