Math Son of Mathonwy is a character from Welsh mythology, specifically featured in the Mabinogion, a collection of medieval Welsh tales. He is known as a powerful magician and a lord of Gwynedd, a region in north Wales. Math has the unique ability to transform his form and is often associated with the themes of magic and transformation. In the stories, Math is depicted as a wise and just ruler who requires his feet to be held by a virgin while he engages in magic. His adventures often involve his nephews, Gwydion and Gilfaethwy, and explore themes of loyalty, betrayal, and the consequences of actions.