Gwen Teirbron was a Breton religious figure who lived during the 5th or 6th century. Born in Brittany, she was the wife of Fragan and is recognized as a saint in both Catholic and Orthodox traditions. Her unique epithet, which translates from Welsh as "three breasts," stems from folk beliefs regarding her spiritual and physical nature. She is remembered alongside her children, including Winwaloe, Jacut, Wethenoc, Creirwy, and Cadfan.