‘The church to which this doorway belongs stands in a glen at the foot of that part of the mountain of Slieve Mairgre called Knockara, two miles and a half from the town of Carlow, in the parish of Killeshin, barony of Slievemargy, and county of Carlow. The name is derived originally from that in the valley in which it was built, Gleann Uissean, by which title it is mentioned in the Annals and Martyrologies.
The ruin stands not far from a rath on a knoll overlooking a little waterfall, which tumbles over a ledge of rock in the ravine at its foot. The gables and side walls of the church are clothed with ivy and long grass. The ancient pillar-clustered doorway, arch within arch, with its rich adornment of sculptured traceries, mouldings, bas-reliefs and inscriptions appearing in the midst of this framework of leaves, forms a picture of extreme beauty.’

‘The church was remodelled at three different periods. Before the east wall fell, it was 66 ft. long by 25 ft. 8 in. broad internally, but as it stands now it measures 90 ft. from end to end, and the eastern part to the distance of 24 ft. was evidently added at a much later period than that at which the original building was erected. This modern portion may be termed the chancel, and is 1 ft 6 in. narrower than the nave. The walls are 3 ft. 8 in. to 4 ft. thick. The masonry is large, showing little trace of the hammer, with deep granite quoins and pilasters at the west end projecting 9 in., and 3 ft. 2 in. wide. In the modern work, the stones are small and hammered, while the quoins are of limestone. The western gable is partly broken away.
The west door is of four orders…Many of the ornaments are identical with those of the doorway at Timahoe [County Laois] and also resemble some of the later work at Tomgraney [County Clare]. The keystone of the outer order bears a venerable human head carved in relief. The design called the trumpet pattern, or divergent spiral, appears among the other ornaments of this door. The jambs are rounded, but the orders of the arch preserve their square form, and are enriched with surface ornament, while the entablature which runs along the top of the jambs is carved at the salient angles into human heads, the long interlaced hair of each head covering the surface of the stone back to the re-entrant angles. Each order of the doorway has engaged shafts at the angles. The bases have the beautiful feature of leaves connecting the bulbous portions with square plinths at the angles. The following inscriptions run along the abaci at each side, and the beginning of another occurs on the front of the jamb of the second order on the north side which appears to have been continued to the top of the jamb…
…The first inscription may be read:-
Pray for Art…King of Leinster, and for…Steward. Pray for…Iena Ua Mel[lach, Prince of Hy] Duach. Pray for Cellac…
The territory of Hy Duach comes within a mile of this church.’ 

‘The chancel arch was pulled down upwards of fifty years ago, and a great part of the south wall of the church destroyed. It is said to have contained two round-headed windows widely splayed inside. Two windows of the same character still remain in the north wall. The most perfect is 7 ft. in height by 3 ft. 6 in. internally and is placed at a height of 9 ft. from the ground…About twenty yards to the south-west of the entrance stood the belfry, a round tower of great height and beauty, the doorway of which faced that of the church and was pulled down upwards of a century ago…Molyneaux, writing in the year 1709, thus alludes to the tower:- “Near the foot of the mountain on this road stands the old church of Killeshin, which is a very old building. Here lately stood, over against the Doore of the Church, one of the old round steeples which I am told, was very high, old and well built, so that when the owner of this place had it fallen, it came to the ground in one solid piece, and was not even by the fall against the ground so broke, but that several vast pieces yet remain sticking together, so that you easily discover what this building was. It plainly appears to be of the same building and age with the adjacent church, and this was certainly an Irish building, as appears by two Inscriptions on either side of the door as you enter…”’

Extracts from Notes on Irish Architecture by Edwin, third Earl of Dunraven, edited by Margaret Stokes, Vol.II, London, 1877.