Dwynwen is believed to have been a daughter of King Brychan Brycheiniog, who lived in the 5th century. Her mother may have been Rigrawst. St.Dwynwen lived in Anglesey, and her name is still recalled in place names such as Llanddwyn and Porthddwyn in Walesand the Church of Sen Adhwynn in Advent, Cornwall.
In the tale told of her, Dwynwen falls in love with a young man named Maelon, but rejects his advances. Stories differ substantially on the events that follow but the outcome remains the same. Either she is raped by Maelon and prays for assistance, or she is unable to marry him due to her father’s refusal and prays to forget her love for him.
An angel provides her with a potion. Maelon drinks it and turns into ice. Dwynwen then prays for three requests (either given as a result of drinking the potion, or prayed for when she sees what happens to Maelon). These three requests are that Maelon be released; that, through her, God look after all true lovers; and that she remain unmarried. She then retreats to the solitude of Llanddwyn Island off the west coast of Anglesey to become a hermit until she dies, in about AD 460.