Post-Roman Celtic Kingdoms

Ceredigion

Founded in circa AD 424, this small coastal kingdom was centered on the Bay of Cardigan. According to tradition, Ceredigion was originally part of the territory governed by the Pictish Gododdin chief, Cunedda, after he was invited by Magnus Maximus to settle in north-west Wales. Cunedda granted the land to Ceretic as his own kingdom, and it was named after him.

The kingdom may at first have included the Roman cantref of Rhos, although this later became a sub-kingdom of Gwynedd in its own right.

c.424 - c.453

Ceretic (Ceredig)

Fifth son of Cunedda Wledig.

c.453 - c.490

Usai ap Ceredig

c.490 - c.525

Serwyl ap Usai

c.525 - c.560

Boddw ap Serwyl

c.560 - c.595

Arthfoddw ap Boddw

c.595 - c.630

Arthlwys ap Arthwfoddw

c.630 - c.665

Clydog ap Arthlwys

c.665 - c.700

Seisyll ap Clydog

Seisyll conquers Ystrad Towy, taking it from Dyfed. The kingdom of Ceredigion, thus enlarged by a third, is renamed the kingdom of Seisyllwg in his honour.

Seisyllwg

Seisyllwg consisted of the former Kingdom of Ceredigion together with the newly conquered territory of Ystrad Towy.

c.700 - c.735

Arthwyr ap Seisyll

c.735 - c.770

Dyfnwal ap Arthwyr

c.770 - c.807

Meurig ap Dyfnwal

by 800

The kingdoms of Builth and Gwerthrynion are taken directly within Seisyllwg.

?807

Arthen

(Annales Cambriae).

c.808 - 872

Gwgan ap Meurig

Drowned. Left no heir.

[c.810

Angharad ferch Meurig

Sister. m. Rhodri Mawr, King of Gwynedd & Powys.]

872

The kingdom passes to Rhodri Mawr, who becomes King of Gwynedd, Powys & Seisyllwg. From this point onwards, Seisyllwg is ruled by a branch of the Kings of Gwynedd as a sub-kingdom.

872 - 909

Cadell ap Rhodri

909 - 920

Clydog ap Cadell

Son. No heir. Mentioned in the Annales Cambriae.

920

Drawn back into a single kingdom of Deheubarth by Cadell's second son, Hywel Dda.

by 1100

Ceredigion is now regarded as a duchy of Gwynedd, and is ruled in the king's name by his sons.

? - 1143

Cadwaladr

Ruled the North. Brother of Owain Gwynedd.

al.1143 - ?

Hywel ap Owain Gwynedd

Ruled the South. Son of Owain Gwynedd. Gained North in 1143.