Aergol Lawhir, King of Dyfed (c.437 - c. 515) was a King of Dyfed

Dyfed

Dyfed is a preserved county of Wales. It was created on 1 April 1974 under the terms of the Local Government Act 1972, and covered approximately the same geographic extent as the ancient Principality of Deheubarth, although excluding the Gower Peninsula and the area west of the River Tawe...

 and son and heir of King Triffyn Farfog

Triffyn Farfog

Triffyn Farfog, King of Dyfed was a King of Dyfed from the House of Eochaid Allmuir, and father of King Aergol Lawhir. Also known as Triffyn the Bearded, he married Gwledyr, the heiress of the British Kings of Dyfed, in the mid-5th century and inherited the kingdom....

. Some sources claim he was born around 480. His residence court was at Lis Castell (Lydstep) near Din Bych (Tenby

Tenby

Tenby is a walled seaside town in Pembrokeshire, South West Wales, lying on Carmarthen Bay.Notable features of Tenby include of sandy beaches; the 13th century medieval town walls, including the Five Arches barbican gatehouse ; 15th century St...

) and may have had a second residence at Castell Argoel in Dyfed. He was patron of the great Bishops of Glywysing, Saint Teilo

Saint Teilo

Saint Teilo, was a British Christian saint - a monk, bishop and founder of monasteries and churches. He was from Penalun , near Tenby, in Pembrokeshire, in south Wales...

 and Euddogwy and welcomed King Budic II of Brittany

Budic II of Brittany

Budic II, King of Brittany was a King of Brittany in the early 6th century. He reputedly married the sister of High-King Arthur of Britain for some time, fleeing to Britain with his father after his cousin's usurpation of the Breton throne...

 when he was expelled from Brittany. Aergol was known to be an enemy of King Cynan Garwyn

Cynan Garwyn

Cynan Garwyn was king of Powys in the north-east and east of Wales, who flourished in the second half of the 6th century. Little reliable information exists which can be used to reconstruct the background and career of the historical figure...

 of Powys and they clashed at Crug Dyfed.