Saint Petroc or Petrock (Medieval Latin: Petrocus; Welsh: Pedrog; French: Perreux; died c. 564) was a British prince and Christian saint.Probably born in South Wales, he primarily ministered to the Britons of Devon (Dewnans) and Cornwall (Kernow), where he is associated with a monastery at Padstow, which is named after him (Pedroc-stowe, or 'Petrock's Place').