Read the story and answer the question.

John Montagu, the 4^th Earl of Sandwich in England, was famous for gambling. He often spent long hours at the card table. History says that he didn’t want to stop playing to eat, so he ordered meat put between two slices of bread so that he could have a meal and continue with the game. His official biographer says that he invented the sandwich not to keep gambling, but to keep from being interrupted while carrying out his devoted service to his community and country.

Who said that the Earl of Sandwich invented the sandwich so that he could keep working, not so that he could keep gambling?