Triffyn son of Rhain (Welsh: Triffyn ap Rhain; died c. 814) was an 8th- and 9th-century king of Dyfed.
On the death of his father, Triffyn did not succeed him—instead, his uncle Owain did.
After Triffyn succeeded Owain, nothing is known about the realm of Dyfed before Hyfaidd went to Alfred the Great in the 880s to request help opposing Rhodri the Great's younger son Cadell.
When Cadifor died, his sons revolted against Rhys,[3] which destabilised his kingdom, setting the scene for the Norman Conquest of South Wales; legends reported in the 16th century (e.g. by John Leland) claim that Cadifor had a brother - Einion ap Collwyn, who was instrumental in the Norman Conquest of Glamorgan.
You can help Wikipedia by expanding it.This article related to the history of Wales is a stub.