Passage: In 1792 during the Reign of Terror of the French Revolution, a secret league of brave Englishmen are rescuing French aristocrats from the guillotine. The leader of this secret society is a mysterious English nobleman known only as the Scarlet Pimpernel, whose signature sign is a humble wayside flower. In society he hides his identity by posing as the wealthy but foppish and seemingly empty-headed Sir Percy Blakeney. After rescuing the Count de Beaulieu and his family, Percy is introduced to the beautiful French actress Marguerite St. Just (Jane Seymour) through her brother, Armand, whom he rescued from an attack. Percy is attracted to Marguerite, but she is in a relationship with Paul Chauvelin, an agent of Maximilien Robespierre. Due to the Scarlet Pimpernel's past successes, Chauvelin is assigned to discover his identity and capture him.
After Percy and his associates smuggle another aristocrat out of the city while picnicking with Marguerite, Chauvelin deduces that the Scarlet Pimpernel must be an English nobleman, and tries to coerce the Count de Tournay to spy on the English court for the Republic. Later, Marguerite and Chauvelin have an argument over the executions and he angrily departs. Percy reveals his identity to Armand and convinces him to use his connections to Chauvelin to investigate the French prison holding the Dauphin, son of the former King of France. Soon after, the Scarlet Pimpernel and his associates rescue de Tournay's family.
What is the full name of the person who hides their identity by posing as a wealthy but foppish man?