Peris was an early Christian monk from Wales, likely active during the 6th century. According to the *Bonedd y Saint*, he is identified as a Cardinal of Rome, though he may have been a son of Helig ap Glannog. He is associated with the secluded area of Nant Peris in North Wales, where he is thought to have lived in solitude. He serves as the patron saint of Llanberis.