The crossword solution for the term GREATEST OF THE RING is ALI, which stands for the legendary boxer Muhammad Ali. Ali was widely considered to be one of the greatest boxers of all time and was known for his impressive speed and agility in the ring. He was the first fighter to win the world heavyweight championship three times and was also an Olympic gold medalist. Ali was a cultural icon and a symbol of strength and courage, making him the perfect answer for the term GREATEST OF THE RING.