Prior to the Synod of Ráth Breasail the Catholic Church in Ireland did not have a diocesan system of governance. The reforming councils of the Church brought Ireland into line with the rest of the Church and established a diocesan system. Today twenty-six dioceses remain while others have been merged and still others have become extinct or used as titular sees.
Titular dioceses Inis Cathaigh Ceanannus Mór Glendalough Slebte Cluain Iraird
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