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|King of Gwent and Glywysing|
|Reign||? - c. 555|
|Issue||Peibio Clafrog, Nynnio|
According to later genealogies, Erb was the son of King Meurig ap Caradog's son, Erbig. Nothing is known of his life. After Erb's death in the mid-6th century, his kingdom was divided between his young sons. Nynnio became king of Gwent and Glywysing and Peibio became the ruler of Ergyng.