Matthaeus Mac CathasaigG Catholic was a bishop in Ireland during the late 13th and early 14th centuries."Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I., eds. (1986). Handbook of British Chronology (3rd, reprinted 2003 ed.). p 338 Cambridge: CUP
The chancellor of Armagh,"Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 3" Cotton, H. p 39 Dublin, Hodges & Smith, 1848–1878 he was consecrated bishop of Clogher in Lisgoole Abbey"Clogher clergy and parishes : being an account of the clergy of the Church of Ireland in the Diocese of Clogher, from the earliest period, with historical notices of the several parishes, churches, etc" Leslie, J.B. p 5: Enniskille; R. H. Ritchie; 1929 on 29 June 1287 and served until his death in 1310."Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 3" Cotton, H. p 75 Dublin, Hodges & Smith, 1848–1878
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