The recumbent cross-slabs are confined almost exclusively to Ireland, although there are one or two in Cornwall, Wales, and Scotland. Much the largest collection is at Clonmacnois, King’s Co., where there are not far short of 200 sepulchral cross-slabs with inscriptions in Irish minuscule letters, giving the name of the deceased and requesting a prayer for his or her soul. A considerable number of the names on the slabs have been identified on sufficiently satisfactory evidence, thus giving reliable dates for a series arranged in chronological order. Clonmacnois was founded by St. Ciaran in A.D. 554, but the greater part of the dated cross-slabs belong to the ninth, tenth, and eleventh centuries. The earliest of these inscribed cross-slabs which exhibits any decorative features is that of Tuathgal,[365] who has been identified with the seventh abbot of Clonmacnois. The death of abbot Tuathgal took place in A.D. 806. There are, therefore, no ornamental cross-slabs at Clonmacnois older than the beginning of the ninth century. The best examples of recumbent cross-slabs with Celtic ornament in Ireland to which reliable dates can be assigned are those of Suibine McMailæhumai[366] at Clonmacnois (A.D. 887), and St. Berechtir[367] at Tullylease, Co. Cork. The latter is specially interesting as having upon it a combination of interlaced-work, key-patterns, and spiral ornament. [365] Petrie’s _Christian Inscriptions in the Irish Language_, vol. i., pl. 12, No. 29. [366] _Ibid._, vol. i., pl. 31, No. 82. [367] _Ibid._, vol. ii., pl. 30. [Illustration: Cross-slab from Pen-Arthur, Pembrokeshire Now in St. David’s Cathedral. Scale ⅛linear] Outside the limits of Ireland there are slabs of the same type, but of unknown date, at Camborne,[368] Cornwall; Pen-Arthur[369] (now in St. David’s Cathedral), Pembrokeshire; and Baglan,[370] Glamorganshire. The recumbent hog-backed or coped stones are more likely to be of Anglian or Scandinavian origin than Celtic. They are most common in the north of England; there are one or two in Wales, and none in Ireland. As instances of coped stones with Celtic ornament we have those at Meigle,[371] Perthshire; and Lanivet,[372] Cornwall.