Thirty-five inscribed slates from Strata Florida Abbey, Cardiganshire, dated to the fifteenth century. Many of the slates are broken fragments with the inscriptions consequently often being incomplete; all are irregular in shape. The inscriptions comprise both text, the majority being in Welsh with examples of Latin and English, and pictures, comprising zoomorphic and anthropomorphic forms, geometric shapes and patterns, as well as other indefinite markings. The majority of the slates are inscribed on one face only, with eleven bearing inscriptions on both sides (SF 1, 3, 5-7, 15, 19, 22, 24, 28-29).
The five slates SF 13-14, 23, 25-26 are all broken fragments of one original slab (along with other still missing sections); with the exception of SF 13 the fragments can be joined up into one larger piece. SF 13-14 and 26 contain parts of a single epitaph, incised in large outline letters, which together appear to read: 'Hic ia[cet] ...es ap ... [a]p ll[ywelyn] [mona]chus'. SF 33 and 35 are also two fragments of a single slate.