Diocese of Roscommon

The Diocese of Roscommon was an Irish diocese that in the twelfth century merged with Diocese of Elphin. One abbot, Siadhail is sometimes styled Bishop'Monasticum Hibernicum; or, an history of the abbeys, priories, and other religious houses in Ireland' Archdall, M. (Dublin: printed for Luke White, 1786) The only other recorded officer was Gille Na Naomh M'Arthur O'Bruin, who was Archdeacon in the mid thirteenth century."Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 4" Cotton, H. p132 Dublin, Hodges & Smith, 1848–1878

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