At the Synod of Rathbreasail in 1111, Tuam was named as the seat of a diocese corresponding roughly with the diocese of Elphin, whilst Cong was chosen as the seat of a diocese corresponding with the later archdiocese of Tuam in west Connacht.
She purchased a former convent building on Achill in 1992, and it was opened as the House of Prayer in 1993 by the then Archbishop of Tuam Joseph Cassidy.
The institutions became known as the 'Godless Colleges', and Kirwan's position came under severe pressure from several leading bishops, including his own metropolitan bishop, John McHale, the Archbishop of Tuam.
William Beresford, seventh son of the first Earl, was Archbishop of Tuam and was created Baron Decies in 1812.
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A canon of Raphoe, he was appointed Archbishop of Tuam by the Holy See on 7 October 1538, but failed to get possession of the see from Christopher Bodkin, who the latter had accepted Royal Supremacy in 1537.
According to Professor Leerssen, he was also one of the few native literati to embrace the new order even to the extent that he was in the employ of Trinity College for a period in the early to mid-1590s, and was also one of those involved with the Gaelic translation of the New Testament, undertaken for purposes of proselytization by the protestant archbishop of Tuam.
Ó Duinnshléibhe was one of two Donegal men named Father Muiris Ulltach who attended Aodh Ruadh Ó Domhnaill (d. 1602) on his death-bed in Simancas Castle, Spain, with Archbishop of Tuam Fláithrí Ó Maol Chonaire.
His brother Stephen de Fulbourn (died 1288) was Walter's predecessor as Bishop of Waterford and was Archbishop of Tuam 1286-1288; their nephew Adam de Fulbourn also held several clerical and judicial offices in Ireland.
Aubrey Gwynn concludes that Ua Oisin was not a Bishop immediately prior to his investiture as the first Archbishop of Tuam and of Connacht.