Located in Carlow town, the cathedral was dedicated to the Assumption of the Blessed Virgin Mary in 1833.

[2] When the cathedral was completed in 1833, the old church built by Dean Staunton was demolished, although part of the transept wall was retained.

A monument to Bishop Doyle was placed in the cathedral in 1840, by John Hogan of Tallow, County Waterford.

[4] A parishioner took action in the Supreme Court against the Cathedral Administrator, Father John Byrne, and the trustees of the Diocese of Kildare and Leighlin in 1996 to prevent the re-ordering of the interior in line with the changes recommended by the Second Vatican Council.

[7] Ahead of the World Meeting of Families 2018 in Dublin, Cardinal Peter Turkson from Ghana was announced as homilist at the opening ceremony at this cathedral.

[12] Colonel Henry Bruen of Oak Park supplied granite from his quarry in Graiguenaspidogue a few kilometres south of Carlow town.

The Sacred Heart altar was a gift of Mary Agnes Kinsella, of the Royal Hotel, in memory of her brother Edward.

In 1878, Miss Keeffe donated a stained-glass window depicting St. Patrick, for the north transept, in memory of her grand-uncle.

[12] In 1855, an organ, purchased at the Paris Exhibition, was installed in the south transept, but later moved to the gallery.

It was made by Samuel Daly and Sons of Cork, and donated by the clergy and religious of the diocese in memory of the Very Rev.

Comerford also gave and consecrated the great bell, cast by John Warren and Sons of London.