Bishop of Clogher, the pre-Reformation, Church of Ireland and Roman Catholic bishops
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Tigernach later became Bishop of Clogher and removed that see to Clones, where he died of the plague in 550.
His abilities as a leader were displayed on many occasions, particularly at the relief of Elphin Castle and he continued very active during this time of confusion, and frequently disturbed Heber MacMahon the Roman Catholic bishop of Clogher, then general of the Ulster army.