Ennis Abbey, Co. Clare.
Courtesy of 'A social history of ancient Ireland'.

An abbey is a church that is associated with a Christian monastery or convent.
Above is a picture of Ennis Abbey, founded in 1240 by Donncadh Cairbreach O'Brien, King of Thomond. This 13th-Century Franciscan Abbey played a central role in the development of the town of Ennis in County Clare.