It was long considered an established fact that the churches of Ireland, previous to the twelfth century, were altogether constructed of wood, or wattles daubed with clay. It was consequently held, on the authority of Ware, that there remained in the country not a single example of church architecture of a period much antecedent to A.D. 1148, in which year died Malachy O’Morgair, who is stated to have erected at Bangor the first ecclesiastical building of stone that had ever appeared in Ireland. The well-directed labours of George Petrie, in seeking among the archæological remains themselves for evidence by which their era might be determined, and in adducing the testimony of Irish manuscripts relative to such structures as were in use at the time of their composition, removed the veil of obscurity which had so long shrouded the subject of Irish ecclesiastical antiquities. He showed that the country not only contains examples of church architecture of the earliest period of Christianity in the kingdom, but also that they exhibit many characteristics of exceptional interest. Though wood appears to have been the material of which the first churches were built, where stone was not abundant and otherwise unused, they were subsequently constructed of stone, and from their small size and peculiar features are among the most interesting remains now existing. The buildings called oratories were evidently intended for the private devotions of the founders, whose graves are so frequently to be found in their immediate neighbourhood. The most singular of these are in the west and south-west of Ireland, and they are generally in sequestered and isolated spots, not only on the small and almost inaccessible islands off the coast, but on mountain tops and lonely lake islands.

Clochaun na Carriage, Aran Island.

Following the ascetic practices and the monastic life of the early Eastern Church, these places, far remote from the abodes of men, were selected as retreats by the early missionaries of the Irish Church. On the wild and almost inaccessible Skellig Rock, on Slieve League and Brandon Mountain, in Gougane Barra Lake, on High Island, Inishglora, Inismurray, and numerous other isolated places, stone cells and oratories were erected, alone or in connection with monastic settlements. The clochaun form of building found in use was adopted, and it was upon this type of rude structure that the first buildings for Christian Church purposes were erected in these places. The monastic cells soon changed from the pagan circular or oval shape, and became rectangular, in the first instance internally, as we find in those of the Skellig remains, which are of a very rude type, and are perhaps the earliest of the kind now existing.

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Plan of Monastic Settlement, Skellig Michael.

Skellig Michael.​—​The Great Skellig lies south-west of Valencia, and about 10 miles from its nearest point. It is called Skellig Michael, from St. Michael the patron saint of high places, as in the isolated rocks in Cornwall and Normandy, also dedicated to him. The Skellig rises magnificently to a height of 704 feet, and a flight of steps originally ran up the face of the cliff to the settlement which stood on an artificial plateau at a height of 545 feet, protected from the edge by a fine cashel of similar masonry to Staigue Fort. The lower portion of the path has been cut away by a new road to the lighthouse, but 620 steps still remain leading to the ruins. These consist of six beehive cells, two oratories, several cemeteries and rude crosses, two wells, and the more recent Church of St. Michael. Five of the cells lie close together in a row, one being at a higher level than the other four; and in a line beyond to the north is a small oratory, right on the edge of the cliff. The remainder of the buildings stand on a lower level of the enclosure. All the buildings, except the church, are constructed of dry rubble masonry. One of the cells is wholly rectangular, and the remainder shaped as already stated; the roofs are formed in the usual fashion, by overlapping, and a small opening was left at the top to emit smoke. The oratories are similarly constructed, but are entirely rectangular, and have a window facing the doorway. For centuries the Skellig was a great place of pilgrimage, and men and women alike performed it. Having visited the ruins, they climbed the highest peak, an ascent which was attended with the utmost peril and risk. The penance is not now practised.