Arvirargus or Arviragus was a legendary British king of the 1st century AD, possibly based upon a real person. A shadowy historical Arviragus is known only from a cryptic reference in a satirical poem by Juvenal, in which a giant turbot presented to the Roman emperor Domitian (81–96 AD) is said to be an omen that "you will capture some king, or Arviragus will fall from his British chariot-pole".[1]