Despite the paucity of written sources for fifth- and sixth-century Britain, there are many inscriptions containing brief texts in Latin or Irish. This paper reinterprets these inscribed stones, showing that, contrary to the universal current assumption that most represent the memorials of secular notables, a much stronger case can be made for understanding them as ecclesiastical monuments associated with the cult of saints. Read in this way, they offer new insights into the fifth- and sixth-century British Church and the evangelisation of the west and north of Britain during these centuries.