Events from the year 1147 in Ireland.
Incumbents High King: Toirdelbach Ua Conchobair Events Bective Abbey is formed by Murchad O’Maeil-Sheachlainn as a daughter house of Mellifont Abbey. The community at St. Mary's Abbey (Dublin) (originally Savigniac) joined the Cistercian order. Antrim Round Tower was burned, and surrounding buildings were later removed.
Deaths Muireadhach Ua Flannagain, a distinguished priest
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