Arianrhod Alternative Names(異名): Arianrhod Arianrhod is a figure in Welsh mythology who plays her most important role in the Fourth Branch of the Mabinogi. She is the daughter of Dôn and the sister of Gwydion and Gilfaethwy; the Welsh Triads give her father as Beli Mawr. In the Mabinogi her uncle Math ap Mathonwy is the King of Gwynedd, and during the course of the story she gives birth to two sons, Dylan Ail Don and Lleu Llaw Gyffes, through magical means. Mabinogion According to the Fourth Branch, Arianrhod's uncle Math fab Mathonwy would die if he did not keep his feet in the lap of a virgin when he was not at war. Gilfaethwy falls in love with his original footholder, Goewin, and he and his brother Gwydion engineer a war with King Pryderi of Dyfed, forcing Math to leave his court. In his absence Gilfaethwy rapes Goewin, but is punished severely when Math returns (Math turns him and Gwydion into a series of mated pairs of animals). Math marries Goewin to alleviate her s...