Who is Mr. Pitt in The Scarlet Pimpernel?

Mr. Pitt is only referred to in the novel The Scarlet Pimpernel. He is not a character that is physically present in the story. "Mr. Pitt" in the novel is a reference to William Pitt "The Younger," who was the Prime Minister of Britain during the French Revolution. He was Britain's youngest Prime Minister. At first he was sympathetic to the cause of the French Revolution. Later, he changed his stance on the Revolution. After the King of France, Louis XVI, was executed by the guillotine at the hands of the revolutionaries, Pitt "expelled the French ambassador" from England. He became a great defender of the established ways of society, which contrasted greatly with the changes in France. Pitt did not want upheaval in his own country.