Post-Roman Celtic Kingdoms

Deheubarth

The kingdom of Deheubarth was formed as a unified state comprising much of Dyfed's territory, along with all of Ystrad Towi and Ceredigion. Cymru had been unified under Rhodri Mawr, and his descendants eventually ruled large areas of the country, often with traditional borders changed by the shake-up.

Under the rule of the kings of Deheubarth, the territory included modern Dyfed (old Carmarthanshire, Pembrokeshire and Cardiganshire, or Ceredigion), and Brycheiniog (now in southern Powys). It also occasionally included Gwynedd, but usually only when Gwynedd's king was also king of Deheubarth (deheu means "of the south", the kingdom's obvious power base).

844 - 878

Rhodri Mawr (the Great)

King of Gwynedd, Dyfed & Seisyllwg, and All Wales.

878 - 916

Anarawd ap Rhodri

King of Gwynedd.

916 - 950

Hywel Dda (the Good) ap Cadell

King of Gwynedd (942-950) & Seisyllwg.

c.920

Hywel effectively forces the King of Brycheiniog to become sub-king to Deheubarth.

950 - 957

Rhodri ap Hywel Dda

Not including Gwynedd, under Iago.

957 - 986

Owain ap Hywel Dda

Not including Gwynedd, under Iago & Hywel the Bald.

986 - 1023

Under the dominion of Gwynedd.

1023

Rhydderch ap lestyn

Usurper.

1023 - 1033

Under the dominion of Gwynedd.

1033

Hywel ab Edwin

1033 - 1035

Maredudd ab Edwin

1039 - 1042

Under the dominion of Gwynedd.

1042 - 1044

Hywel ab Edwin

Second time.

c.1045

Upon the death of the last king of Brycheinoig, the kingdom is divided between his sons, and all effective power passes to Deheubarth.

1055 - 1063

Under the dominion of Gwynedd.

1064

Maredudd ab Owain ab Edwin

Rule uncertain.

1063 - 1072

Under the dominion of Gwynedd.

1072

Rhys ab Owain

1072 - 1078

Under the dominion of Gwynedd.

1078 - 1093

Rhys ap Tewdwr Mawr

Not including Gwynedd, under Gruffydd ap Cynan.

1093 - 1135

Gruffydd ap Rhys

Not including Gwynedd, under Gruffydd ap Cynan.

1135 - 1137

Under the dominion of Gwynedd?

1137 - 1143

Anarawd ap Gruffydd

Not including Gwynedd, under Owain Gwynedd.

1143 - c.1151

Cadell ap Gruffydd

c.1151 - 1155

Maredudd ap Grufydd

1155 - 1197

Rhys ap Gruffydd

The Lord Rhys.

1197

Following the death of the Lord Rhys, what is left of his kingdom in the face of increasing pressure by the Normans, is divided between his warring sons.

1196 - 1202

Gruffydd ap Rhys

Ruled from May.

1202 - 1236

Owain ap Gruffydd

Last independent Welsh prince of South Wales.

1236

The power of Deheubarth had been declining for years, and by this point the practical end of the dynasty had arrived. Deheubarth is subjugated under Norman rule.