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Wiki information Brennius:

Brennius
Man, Deceased Person, Person

Brennius was a legendary king of Northumberland and Allobroges, as recounted by Geoffrey of Monmouth. He was the son of Dunvallo Molmutius and brother of Belinus, probably based upon one or both of the historical Brenni.

Belinus
Deceased Person, Person

Belinus the Great was a legendary king of the Britons, as recounted by Geoffrey of Monmouth. He was the son of Dunvallo Molmutius and brother of Brennius. He was probably named after the ancient god Belenus.