Kingdom of Powys Wenwynwyn

Southern Powys, or Powys Wenwynwyn (Welsh for 'Gwenwynwyn's Powys'), was a Welsh lordship which existed during the high Middle Ages. The realm was the southern portion of the former princely state of Powys which split following the death of Madog ap Maredudd and the killing of his heir Llywelyn in 1160: the northern portion (Maelor) went to Gruffydd Maelor and eventually became known as Powys Fadog; while the southern portion (Cyfeiliog) going to Owain Cyfeiliog and becoming known, eventually, as Powys Wenwynwyn after Prince Gwenwynwyn ab Owain, its second ruler. Southern Powys and Gwynedd became bitter rivals in the years that followed, with the former frequently allying itself with England to further its aims of weakening the latter.