Dubricius or Dubric was a 6th-century British ecclesiastic venerated as a saint. He was the evangelist of Ergyng and much of south-east Wales.
Stained glass depiction of Dubricius, designed by William Burges, at Castell Coch, Cardiff
Ergyng was a Welsh kingdom of the sub-Roman and early medieval period, between the 5th and 7th centuries. It was later referred to by the English as Archenfield.
Post-Roman Welsh kingdoms. Ergyng is in the southeast (lower right). The modern Anglo-Welsh border is also shown.