Dumgarth rex Cerniu [id est Cornubiæ] mersus est.
Dungarth king of Cernyw ‡that is of the Cornish‡ was drowned. Annales Cambriae, A.D. 875.
The site consists of the remains of two 9th-11th century granite cross-shaft fragments and an underground rock-cut passage that starts to the south-east of the crosses and terminates in a cross-shaped chamber beneath the two stones, thought to be either the remains of tin workings or a possible oratory.
King Doniert’s Stone stands about 4 feet 6 inches (1.37 metres) high, and is decorated on three of its faces with interlaced ornament of a style common throughout Britain. The upper end of the stone has a deep mortice in the top to take an upper shaft or cross head. The east face bears a weathered inscription which reads:
DONIERT ROGAVIT PRO ANIMA
Doniert has asked [for this to be made] for [the sake of his] soul
The southern cross-shaft fragment is taller, about 7 feet (2.1 metres) high, and one face has a panel of interlaced decoration.