Post-Roman Celtic Kingdoms

Domnonia (Dumnonee)

Situated to the north east of Brittany, the earliest princes are mentioned in several Lives of the Saints.

The three Armorican principalities were all subservient to the King of Brittany. Until the reign of Jonas, the rulers of Domnonia were titled princes. After  that, they supply the Kings of the Bretons, and Domnonia itself was elevated as a result.

Gerenton (Gereint)

Catou (Cadwy)

Urbien (Erbin) ap Gereint

?Mistakenly named Erbin ap Custennin Corneu, of Dumnonia.

c.380

Guitol / Gwidol ap Gradlon

Son of the King of the Bretons.

c.420

Deroch I

Son.

c.460

Riotham

Son.

c.500 - 520

Riwal Deroc/Ferox

Son. Nicknamed 'the Obstinate/Arrogant'.

520 - 530

Deroc II

Son.

530

With the reign of Jonas (Ionas ap Deroch), the principality is raised to a kingdom.

530 - 540

Jonas (Ionas/Wiomarch/Widimacl)

Son. Killed by Conomor. m. dau of Budig II King of the Bretons.

540 - c.550

Judual (Iudwal ap Ionas)

Son (b.c.530). Imprisoned.

al.550 - 560

Conomor (Cunomorus)

Killed in battle against Clotair, king of the Franks.

560 - 585

Judual

Restored.

585 - 607

Judual (Iudhael ap Iudwal)

Son (b.c.560).

607 - c.615

Haelog ap Iudhael

al.635 - 657

Judicaël (St Iudicael ap Iudhael)

?Son. ?Same as Iudicael, King of the Bretons.

635 - 657

Under Judicaël's reign, Bro Erech is merged with Domnonia. Judicaël was descended on his great grandmother's side from Waroch of Bro Erech. As it seems highly probably that Judicaël King of Domnonia was also Iudicael, King of the Bretons, Domnonia's kings probably continue as high kings of Brittany, and Domnonia effectively becomes the chief state of the colony, their kings listed as Kings of the Bretons.