‘The Cathedral of Aghadoe  or Achadh-dá-eó’ (the Field of the Two Yews) is situated three miles west of Killarney, on high ground, 405 feet above sea level, from which, perhaps, a better general idea of the magnificence of the lake and mountain scenery of the district can be got than from any other point of vantage in the neighbourhood. The ground slopes up the whole way from the north shore of the Lower Lake to the Cathedral, a distance of about a mile. No one who has visited any considerable number of ancient ecclesiastical buildings can fail to have been struck by the care which the monks took in selecting sites where feelings of religious devotion might be intensified by the contemplation of all that is beautiful in nature. Sometimes the church stands beside a brawling stream, amidst the sylvan scenery of some secluded glen; or it is found by the banks of the broad river flowing through the rich meadows of the plain; or, as at Aghadoe, the charm lies in the extent of the landscape to be seen from an elevation, with its ever-changing effects of light and shade and variations of colour. The ecclesiastical remains at Aghadoe consist of the ruins of the Cathedral and the stump of a round tower, besides which are the mouldering remains of an old castle on the grassy hill-side sloping down towards the Lake. A church was founded here at a very early period by St Finan, the Leper, who also founded the monastery of Innisfallen, and whose festival is held on March 16th. Aghadoe afterwards became the site of a bishopric which was in later times joined to that of Ardfert…’
From ‘Notes on the Antiquities in Co Kerry’ by J. Romilly Allen, Journal of the Royal Society of Antiquaries of Ireland, Volume II, Fifth Series, 1892

‘All the interest of this building is concentrated in the west door. It is of four orders. The external order is more or less destroyed; it is now composed of three different ornaments, parts of three arches which have been stuck in when the door was repaired and patched up. I have rubbings of one…it is an uncommon variety of the incised chevron. The height of this doorway above the present level of the ground is 5ft 3in; the width at the top is 2ft 7in, and 2 ft 9in at the bottom. The bases of the jambs are square, plain and slightly projecting. The shafts have the rope pattern with beads…There is a peculiar ornament running around one of the orders. I should say the height of the jambs is 5ft 8in, not 4ft, and that one-third of their length is hidden which spoils the proportions of the door as represented. It is built of sandstone which is said to have been brought from a distance, there being none like it to be found for many miles around…’
From Notes on Irish Architecture by Edwin, third Earl of Dunraven, edited by Margaret Stokes (London, 1877)

‘The Castle or Military Tower is situated outside the churchyard, a little way down the hill to the south. It is a circular Norman keep of the thirteenth century, 21 ft diameter inside, having walls about 6ft thick, rudely built of rounded, water-worn boulders. A staircase in the thickness of the wall leads to the first floor, and there are indications of a second floor above. The doorway is on the east side on a level with the ground. The tower stands within a square intrenchment, having projecting bastions of the south side.’
From ‘Report on the Forty-Sixth Annual General Meeting at Kerry, Ireland’. Archaeologica Cambrensis, The Journal of the Cambrian Archaeological Society, Volume IX, Fifth Series, 1892)