Related Clues:

• Self-proclaimed 'Greatest'
• Lord of the rings?
• 'Rumble in the Jungle' contender
• Laila's father
• Seventh-century Arab caliph
• Ayatollah ___ Khamenei
• Heroic figure of the 1996 Olympics
• "The Greatest" in the ring
• Sports legend
• He could 'float like a butterfly, sting like a bee'
• Onetime ring king
• 2001 sports biopic
• Eastern ruler
• Former Frazier foe
• Louisville museum subject