Mug Ruith (or Mogh Roith, "slave of the wheel") is a figure in Irish mythology, a powerful blind druid of Munster who lived on Valentia Island, County Kerry. He could grow to enormous size, and his breath caused storms and turned men to stone. He wore a hornless bull-hide and a bird mask, and flew in a machine called the roth rámach, the "oared wheel". He had an ox-driven chariot in which night was as bright as day, a star-speckled black shield with a silver rim, and a stone which could turn into a poisonous eel when thrown in water.