The Chapel Royal in Dublin Castle was the official Church of Ireland chapel of the Household of the Lord Lieutenant of Ireland from 1814 until the creation of the Irish Free State in 1922. The creation of the new Irish state terminated the office of Lord Lieutenant and British government control in Ireland.

 In 1943, the church became the property of the Irish Army, and the former Church of Ireland chapel became a Roman CatholicChurch, under the name the Church of the Most Holy Trinity. The Stations of the Cross were then carved by the monks in Glenstal Abbey and presented to the church in 1946. Though it has not been deconsecrated, neither Masses nor Divine Services take place there any more. It has however been recently restored to its nineteenth-century state and is open to the public. The crypt is sometimes used for cultural events.