List of kings of Dumnonia

[1] Known as Caer Uisc, Exeter was inhabited by Dumnonian Britons until c. 936, when King Athelstan expelled them.

[2] Several other royal residences may also have served the kings of Dumnonia or Cornwall, including Tintagel and Cadbury Castle.

(The earlier portion follows the Dumnonian line beginning with Gereint, Cado, Erbin, Guitol ap Gradlon, Marchell, and Riothamus[5]) Susan Pearce views the only native 4th- to 7th-century Dumnonian rulers known to history as: Pearce identifies Constantine with the Constantine mentioned by Gildas, anchoring his reign to the 6th century, and giving later dates for the reigns of Erbin, Geraint, and Cadwy.

[6] By the end of the 8th century, Dumnonia was much reduced in size by the advance of the West Saxons and the remaining territory became a rump state in Cornwall.

[4] If he is not to be identified with Hywel Dda of Deheubarth, the singularly recorded Huwal could have been the last native king.