Judicael or Judicaël (c. 590 – 16 December 647 or 652) (Breton: Yudikael),[1] also spelled Judhael (with many other variants),[2] was the King of Domnonée, part of Brittany, in the mid-7th century and later revered as a Roman Catholic saint.

Guntram, Chilperic's brother, retained his lordship over Waroch and the Brittani formed a Frankish tributary-vassal state through the reign of Dagobert I.

[3] Judicael was born around the year 590, the eldest son of Judael or Judhael, King of Domnonée, and Queen Prizel, the daughter of Ausoch, Count of Léon.

Bishop Ouen of Rouen, in his 'Life of Éloi of Noyon' and the pseudo-Fredegar in his 'Chronicle' relate that in 635/636 during the reign of Dagobert I, the Bretons attacked the borders of the Franks.

In the Cartulary of Redon, it is recorded that a noblewoman called Roiantdreh adopted King Solomon of Brittany as heir to her lands in AD 869, her son Owain having predeceased her.

[8] In 1514, Alain Bouchart, in his 'Grandes Chroniques' constructed a complete list of 'Kings of Brittany' largely based on the fictional work of Geoffrey of Monmouth and claimed they descended from the legendary King Conan Meriadoc.