Urianus was a legendary king of the Britons as accounted by

Geoffrey of Monmouth Geoffrey of Monmouth (; ; ) was a Catholic cleric from Monmouth, Wales, and one of the major figures in the development of British historiography and the popularity of tales of King Arthur. He is best known for his chronicle '' The History of ...

. He came to power in 227BC. He was the son of King Andragius and was succeeded by Eliud.Sacred Texts website, ''Histories of the Kings of Britain (Book III)'', by Geoffry of Monmouth, tr. by Sebastian Evans, (1904)
/ref> Geoffrey may possibly have based the character on that of

Urien Rheged Urien ap Cynfarch Oer () or Urien Rheged (, Old Welsh: or , ) was a powerful sixth-century Common Brittonic, Brittonic-speaking figure who was possibly the ruler of the territory or kingdom known as Rheged. He is one of the best-known and b ...

(6th century), although there is no resemblance between them.

References

{{Geoffrey of Monmouth Legendary British kings 2nd-century BC legendary monarchs