Who called George Washington the greatest man in the world?

King George III, after Washington defeated him in the war, he asked one of his American consultants what he will do next. The consultant (I don't remember his name) said Washington will probably return to the farm. Considering Washington was the richest and now the most popular man in America, and a military revolutionist (consider others like Lenin, Napoleon, Caesar), King George said "If he does that, he will be the greatest man in the world"