 Ua Cuaggain and Ua Tormadain are noted as chiefs in 1159.
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The parish of Drumreilly derives its name from Druim Airbhealaigh, (pronounced 'Drum-ar-va-lay') which means "the ridge of the eastern pass".The parish is centered on the medieval island church in Lough Garadice, whose ruins are extant today.All churches of the parish, and one townland, inherited the parish name.