Rhys ab Owain (died 1078) was a king of

Deheubarth Deheubarth (; lit. "Right-hand Part", thus "the South") was a regional name for the realms of south Wales, particularly as opposed to Gwynedd (Latin: ''Venedotia''). It is now used as a shorthand for the various realms united under the House o ...

in southern Wales. Rhys was the son of Owain ab Edwin of the line of

Hywel Dda Hywel Dda, sometimes anglicised as Howel the Good, or Hywel ap Cadell (died 949/950) was a king of Deheubarth who eventually came to rule most of Wales. He became the sole king of Seisyllwg in 920 and shortly thereafter established Deheubart ...

, and member of the Dinefwr dynasty. He followed his brother Maredudd as king of Deheubarth in 1072. Together with the nobility of

Ystrad Tywi Ystrad Tywi (, ''Valley of the Tywi'') is a region of southwest Wales situated on the banks of the River Tywi and possibly the River Loughor. Although Ystrad Tywi was never a kingdom itself, it was historically a valuable territory and was foug ...

, he was implicated in the killing of

Bleddyn ap Cynfyn Bleddyn ap Cynfyn ( owl, Bledẏnt uab Kẏn ỽẏn; AD 1075), sometimes spelled Blethyn, was an 11th-century Welsh king. Harold Godwinson and Tostig Godwinson installed him and his brother, Rhiwallon, as the co-rulers of Gwynedd ...

king of Gwynedd and

Powys Powys (; ) is a county and preserved county in Wales. It is named after the Kingdom of Powys which was a Welsh successor state, petty kingdom and principality that emerged during the Middle Ages following the end of Roman rule in Britain. Geog ...

in 1075. In 1078 he was defeated by

Trahaearn ap Caradog Trahaearn ap Caradog (1044 – 1081) was a King of Gwynedd. Trahaearn was a son of Caradog ap Gwyn, ruler of Arwystli (in the south of present-day Montgomeryshire, Wales), a small state, on the south-western border between Gwynedd and Powys. He ...

, who had followed Bleddyn on the throne of Gwynedd, in a battle at Gwdig (modern day

Goodwick Goodwick (; cy, Wdig) is a coastal town in Pembrokeshire, Wales, immediately west of its twin town of Fishguard. Fishguard and Goodwick form a community that wraps around Fishguard Bay. As well as the two towns, it consists of Dyffryn, Stop-and ...

). Later the same year Rhys was killed by

Caradog ap Gruffydd Caradog ap Gruffydd (died 1081) was a Prince of Gwent in south-east Wales in the time of Gruffydd ap Llywelyn and the Norman conquest, who reunified his family's inheritance of Morgannwg and made repeated attempts to reunite southern Wales ...

of Gwent. His defeat and death were hailed in the annals as "vengeance for the blood of Bleddyn ap Cynfyn". Rhys was followed as king of Deheubarth by his second cousin, Rhys ap Tewdwr.

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Further reading