Dwynwen was a 5th-century Welsh saint, identified as the daughter of King Brychan of Brecon. According to legend, she lived on the island of Ynys Llanddwyn, where she served as a hermit after choosing a life of solitude. She is widely recognized as the patron saint of lovers and is also associated with the protection of sick animals. Her legacy continues through the celebration of her feast day on 25 January, which serves as a Welsh cultural equivalent to Valentine's Day.