Boxing legend Muhammad Ali welcomed the Prince of Wales and Duchess of Cornwall to his home city of Louisville, describing Charles as "the greatest".
The sport star's words came in a letter rather than in person as he was not well enough to join leading figures from the city at a cultural greeting for the royal couple, who were in the city on the final day of their US tour.
The Duchess of Cornwall has paid a visit to the home of the world famous Kentucky Derby where she met two unlikely entrants.
As part of her trip to Lousiville, Camilla was at the Churchill Downs racecourse to celebrate the work of the Brooke, a worldwide equine welfare charity of which she is president.
Whilst there she met a pair of donkeys and gave them treats after "giving them a good scratch".
The visit came on the final day of Prince Charles and Camilla's four day trip to the US.
Barack Obama told Prince Charles that American people rate UK royalty above their own politicians on the royal couple's Washington tour.
Watch Prince Charles try - and fail - to get a strike on the bowling alley during a trip to a veterans' retirement home in Washington.
Charles and Camilla spent a busy first full day of their US trip visiting memorials to President Abraham Lincoln and Martin Luther King Jnr.