Celtic Kingdoms of the British Isles

Gwerthrynion (Guorthigirniaun)

This tiny principality or region was located to the north of Builth. It seems to have been part of Vortigern's ancestral lands, and bears his name in its Welsh form.

Initially part of Vortigern's Powys, it was governed entirely by Builth and subject to its rule. Its rulers were the same of those of Builth itself, all of whom could trace their descent to Vortigern, but information on the principality is extremely patchy.

c.406 - c.760

Ruled directly from Builth.

mid-400s

The minor kingdom of Maelienydd is formed, seemingly out of territory of Powys, with Gwerthrynion bordering it to the west and Powys surrounding it to the north, east and south.

by 800

The kingdom ceases to exist, being absorbed by Seisyllwg and then Deheubarth.