Possible Clues:

• Fifth century scourge
• Get at the scourge of God with a twisted tail
• Fifth-century epitome of cruelty
• -- the Hun
• King who had an audience with Pope Leo I
• Great king of the huns
• Brutal invader, one who cultivates land, some say
• Fifth-century emperor remembered as the epitome of cruelty
• King defeated at Châlons
• Historical figure on whom a Verdi opera is based