Dyfan of Merthyr
Saint Dyfan of Merthyr, Protomartyr of Wales (2nd cent.), also known as Deruvianus  or Damian, is said to have been one of the missionaries sent to the Britons by Saint Eleutherius at the prayer of the king, St. Lucius. The Anglican church of Merthyr Dyfan Berry  in Wales, shows the popular tradition that he ended his days by martyrdom. He is commemorated by the church May 14 
- His name has been Latinised into Deruvianus or Damian; or rather it is some such Latin appellation which has been rendered into the Celtic Dyfan.
- The parish of Merthyr Dyfan Barry, South Wales originates from AD. 180. The present church was built in the early thirteenth century by the Normans and now belongs to the Anglican church.