Donyarth (Latin:Doniert) orDungarth (died 875) was the last recorded king ofCornwall. He was probably an under-king, paying tribute to theWest Saxons.[1]
He is thought to be the 'Doniert' recorded on an inscription onKing Doniert's Stone, a 9th-century cross shaft which stands inSt Cleerparish in Cornwall, although he is not given any title in the inscription.[2][3][4]
According to theAnnales Cambriae, he drowned in 875. His death may have been an accident, but it was recorded in Ireland as a punishment for collaboration with theVikings, who were harrying the West Saxons and briefly occupiedExeter in 876 before being driven out byAlfred the Great following the victory ofOdda, Ealdorman of Devon at theBattle of Cynwit in 878.[1]Philip Payton states that one must imagine that he drowned in theRiver Fowey, near King Doniert's Stone.[4]