A king of Dyfed (South Wales) in the traditional Arthurian period, around the year AD 500. Agricola is one of the few persons spoken of with favor by Gildas. Several sources say he may have liberated Demetia (Dyfed) from the pagan Irish Uí Liatháin clan, which had previously ruled there, driving them out of Britain.

He may have been one of Arthur's commanders, a general, or an ally, of a historical Arthur.

He was the son of Tribunis (which may have been a title, not a personal name) and the father of Vortipore.