Wacho or Waccho was king of the Lombards before they entered Italy from an unknown date (perhaps circa 510) until his death in 539. He usurped the throne by assassinating (or having assassinated) his uncle, King Tato (again, probably around 510). His cousins (sons and grandsons of Tato), who fled to the Gepids, tried to drive him out of power, but failed.