John Oliver was an Anglican priest, most notably Archdeacon of Ardagh from 1762 until his death in 1778."Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 3" Cotton, H. p193 Dublin, Hodges & Smith, 1848-1878
The son of Robert Oliver of Castle Oliver, he was educated at Trinity College, Dublin."Alumni Dublinenses: a register of the students, graduates, professors and provosts of Trinity College in the University of Dublin (1593-1860)", ed. Burtchaell, G.D., Sadlier, T.U. p. 637: Dublin, Alex Thom and Co, 1935 He married Elizabeth, the daughter of Archbishop John Ryder. One of his sons was an admiral; and another a general.National Archives
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