Arvirargus (or Arviragus) was a legenary, and possibly historical, British king of the 1st century AD. 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 (AD 81 – 96) is said to be an omen that "you will capture some king, or Arviragus will fall from his British chariot-pole".