Rheinwg

The Kingdom of Rheinwg (Welsh: Teyrnas Rheinwg) was a Brittonic kingdom in wales, which is often thought to have been a union of the kingdoms of Dyfed and Brycheiniog ^[1]

Kingdom of Rheinwwg Teyrnas Rheinwg
Map of the kingdom of Dyfed and kingdom of Brycheiniog
Common languages	old Welsh, Vulgar Latin, old Irish
Government	Monarchy
Historical era	Middle Ages
Preceded by Succeeded by sub-Roman Britain Deheubarth Lordship of Brecknock

History

Rheinwg emerged during the early medieval period as a territorial designation for the expanded kingdom of Dyfed, which incorporated Brycheiniog by the 8th century.^[1] The union originated under Cloten of Dyfed and Brycheiniog (fl. c. 650 CE), who married Ceindrych, heiress of Brycheiniog, consolidating both regions under a single dynasty. This union persisted until the early 8th century, when Rhain ap Cadwgan (d. c. 740) ruled the combined realm.^[1]

The kingdom’s territorial integrity was challenged by Seisyll of Ceredigion, who annexed Ystrad Tywi (a region of Dyfed) c. 710 CE. The remaining territories of Dyfed and Brycheiniog were subsequently termed Rheinwg, likely named after Rhain ap Cadwgan. By the 12th century, Rheinwg’s geographic scope had become obscure, with later scholars misinterpreting its boundaries.^[1] According to the Annales Cambriae Rheinwg was devastated by Offa of Mercia in 797.^[2]

Kings of Rheinwg

• Rhain ap Cadwgan
• Tewdws ap Rhain
• Cloten of Dyfed and Brycheiniog
• Cynan Garwyn ^[3]