Tewdrig was a 6th-century monarch of the post-Roman Kingdom of Glywysing in Wales. After abdicating his throne to his son, Meurig, he retired to live as a hermit. However, he was eventually called back to military service to defend his kingdom against an invading Saxon force. Although he successfully led his son's army to victory, he sustained fatal wounds during the conflict. Because he died defending his Christian realm against pagans, he is remembered as a martyr and a saint.