The modern Navan Parish is made up of five
mediaeval parishes: Athlumney, Cannistown, Donaghmore, Dunmoe and Navan. Although cemeteries still survive in these locations, the churches were suppressed in the
Penal Laws era, with many surviving simply as derelict buildings. St. Mary's Church is named after the mediaeval Augustinian abbey which was located on the outskirts of the Parish called St. Mary's. St. Mary's Abbey and its associated granges were suppressed on the orders of King
Henry VIII, the English monarch proclaimed
King of Ireland, who suppressed religious orders throughout his English and Irish kingdoms, often forcibly, as part of his dispute with the
Holy See over its refusal to grant an annulment of his marriage to his first wife,
Catherine of Aragon. The modern St. Mary's was one of many Catholic churches built in Ireland following
Catholic Emancipation in 1829, when the last of the
Penal Laws was repealed. It is located between
Trimgate Street, one of the main streets of the mediaeval town of Navan, and the Fairgreen, with the main entrance facing onto the
Fairgreen, where parking is available. Fr. Eugene O'Reilly decided to build the church along with helping form various schools in the town. The decision to build St. Mary's was taken at a public meeting on 9 September 1834 at which Fr. Eugene O'Reilly P.P. presided. A committee of 34 was formed and it was "resolved that the present chapel is by far too small for the present congregation and that we do forthwith enter on the erection of a new one". It has come down in folklore that Fr. O'Reilly spoke the following or similar words at the meeting: "Why do people go to a theatre? Because they can see and hear everything that passes on the stage. I'll build a church to hold 3000, where everyone can see and hear the priest". The church itself contains a monument commemorating the fact that it was built with the permission of the major landowner in the area at the time, the
Duke of Bedford. The Duke's family, the Russells, were also commemorated until recently in the name of a nearby hotel (since rebuilt and renamed). The local Church of Ireland contains a balcony that was reserved for the duke and his family when they attended services there. ==Church webcam and technology==