Clarence House: A letter from boxing legend Muhammad Ali was read out to Their Royal Highnesses by the Mayor of Louisville during a visit to the Kentucky Centre for African American Heritage. He ends by telling The Prince and The Duchess "we think you are the greatest".#RoyalVisitUSA

A letter from boxing legend Muhammad Ali was read out to Their Royal Highnesses by the Mayor of Louisville during a visit to the Kentucky Centre for African American Heritage. He ends by telling The Prince and The Duchess "we think you are the greatest".#RoyalVisitUSA

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