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Beacon Hill Cemetery was excavated by Charles Thomas in 1969.[1] The cemetery contains four inscribed stones, dated to the 5th or 6th century AD.[2] The site was originally enclosed by a curvilinear bank and ditch, which is still visible in the southwest corner, however, the other walls were moved when the Old Light was constructed in 1819.[3] Celtic Christian enclosures of this type were common in Western Britain and are known as Llans in Welsh and Lanns in Cornish. There are surviving examples in Luxulyan, in Cornwall; Mathry, Meidrim and Clydau in the south of Wales; and Stowford, Jacobstowe, Lydford and Instow, in Devon.[citation needed]