Subsequent kings of Dumnonia (for example Donyarth and possibly Huwal) reigned over an area that was eventually reduced to the limits of present-day Cornwall.
[1] A long and rather acrimonious letter survives that is addressed to Geraint from Aldhelm, Bishop of Sherborne, discussing the Easter Problem and the shape of the tonsure.
It is clear from this letter that in the later 7th century the Britons in Cornwall and Devon still observed Easter on the dates that the British church had calculated, at variance with Roman Catholic practice.
[2] Following Geraint's death, however, Ine was unable to establish his authority further west; in 722, according to the Annales Cambriae, the Cornish won the Battle of Hehil, probably against Wessex.
The latter took place in the more northerly Kingdom of Strathclyde (also called Damnonia after the Damnonii tribe of the area in Romano-British times, and easily confused with Dumnonia/Devon).