1150 – Baltinglass Abbey, Co. Wicklow Baltinglass Abbey is one of the most important Cistercian abbeys of Leinster. and was founded in 1148 by Dermot McMurrough, king of Leinster.
1890 – St Michael’s Church (Synod Hall), Christchurch Place, Dublin Architect: George Edmund Street St Michael’s Church dating from the 12th Century is embedded in the Synod Hall of Christ Church Cathedral.