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The Diocese of Tuam, Killala and Achonry (also known as the United Dioceses of Tuam, Killala and Achonry) is a former diocese in the Church of Ireland located in Connacht; the western province of Ireland. It was in the ecclesiastical province of Armagh. Its geographical remit included County Mayo and part of counties Galway and Sligo. Between late 2021 and early 2022, the diocese was amalgamated into the Diocese of Tuam, Limerick and Killaloe.
General info from Wikipedia.org