Donyarth (Latin: Doniert) or Dungarth (died 875) was the last recorded king of Cornwall, the rump state of the ancient British kingdom of Dumnonia, which had also covered Devon. He was probably an under-king, subject to the West Saxons.
He is thought to be the 'Doniert' recorded on an inscription on King Doniert's Stone, a 9th-century cross shaft which stands in St Cleer parish in Cornwall, although he is not given any title in the inscription.
According to the Annales Cambriae, he drowned in 875. His death may have been an accident, but it was recorded in Ireland as a punishment for collaboration with the Vikings, who were harrying the West Saxons and briefly occupied Exeter in 876 before being driven out by Alfred the Great. Philip Payton states that one must imagine that he drowned in the River Fowey, near King Doniert's Stone.
- Charles-Edwards, T. M. (2013). Wales and the Britons 350-1064. Oxford: Oxford University Press. pp. 431, 494. ISBN 978-0-19-821731-2.
- Charles Thomas. (1986). Celtic Britain. Ancient Peoples & Places Series. London: Thames & Hudson
- Mark Stoyle. (2002). West Britons: Cornish Identities and the Early Modern British State. Exeter: University of Exeter Press. ISBN 0-85989-687-0.
- Payton, Philip (2004). Cornwall: A History (2nd ed.). Fowey: Cornwall Editions Ltd. p. 56. ISBN 1-904880-00-2.
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