Enniaunus (Welsh: Einion mab Arthal) was a legendary king of the Britons as recounted by Geoffrey of Monmouth. He came to power in 293BC.[1]
He was the son of King Archgallo and brother of Marganus II. According to Geoffrey, he ruled poorly and harshly causing him to be deposed due to tyranny.[2] He was replaced with his cousin, Idvallo.