Llantrisant is a town in the county borough of Rhondda Cynon Taf, within the historic county boundaries of Glamorgan, Wales, lying on the River Ely and the Afon Clun. The three saints of the town's name are SS. Illtyd, Gwynno, and Dyfodwg. Llantrisant is a hilltop settlement, at an altitude of 174 m above sea level. The town is home to the Royal Mint.