Diocese of Roscommon explained

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^[1] The only other recorded officer was Gille Na Naomh M'Arthur O'Bruin, who was Archdeacon in the mid thirteenth century.^[2]

Notes and References

1. 'Monasticum Hibernicum; or, an history of the abbeys, priories, and other religious houses in Ireland' Archdall,M. (Dublin: printed for Luke White, 1786)
2. "Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 4" Cotton, H. p132 Dublin, Hodges & Smith, 1848–1878