Johannes (also known as John), O.Cist. was an Irish bishop in the late twelfth and early thirteenth centuries."Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 1" Cotton, H. p383 Dublin, Hodges & Smith, 1848-1878
Formerly Abbot of Monasterevin, he was consecrated Bishop of Leighlin at Rome by Pope Innocent III on 18 September 1198; and died in 1201. His brother William was the first recorded Archdeacon of Leighlin, holding the office in 1200."Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 1" Cotton, H. p397 Dublin, Hodges & Smith, 1848-1878
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