Ballintubber Abbey, County Mayo, Ireland
About seven miles south of Castlebar (the county town of Mayo), lies a village called Ballintubber. Ballintubber's history goes back to pre-Christian times, people came from the east through Ballintubber on their way to the holy mountain on the west coast now called Croagh Patrick. Ballintubber - in Irish Baile an Tobair (the 'town' of the well) - gets its name from a well dedicated to St Patrick the patron Saint of Ireland.

Augustinian Church, Galway, Ireland.
Work began on the Augustinian foundation in Galway in 1500. It was located outside the city walls, on the same site as the present Forthill Cemetery.

Saint Mary’s Pro-Cathedral, Dublin
St Mary’s Pro-Cathedral is situated on Dublin’s North side in Malborough Street. The church which serves as the Cathedral of the Roman Catholic Archdiocese of Dublin was constituted in 1825 from Saint Mary’s Chapel Liffey Street, whose pre-Reformation monastic antecedent was the Cistercian Abbey of Saint Mary’s founded in the twelfth century. The present church is built on a site that was part of the ancient monastic foundation. The church was dedicated on 14th November 1825, the Feast of Saint Laurence O’Toole, Patron Saint of the Archdiocese of Dublin under the patronage of the “Conception of the Virgin”....

St. Peter's Church of Ireland, Drogheda
St. Peter's Church of Ireland is built on a site which has been a centre of Christian worship at least since the founding of the town of Drogheda itself in the latter part of the 12th century. Although there may have been a Celtic Church here in earlier times, the dedication to St. Peter suggests that it was an Anglo-Norman foundation. The first church on the site was probably built about the same time as Mellifont Abbey, as the remains of some of the original tiles and mouldings found on the site are similar to those found at Mellifont....