U.S. President Woodrow Wilson, a huge baseball fan, once autographed a baseball that was auctioned off for war charities.
George V autographed the Stamford Bridge first ball, which was set aside and presented to Wilson following the war. The King borrowed an American fountain pen to sign the ball George R. I., underline it with a flourish and add July 4, 1918. The R. I. was Latin for Rex Imperator, king-emperor.