Il Marchese del Grillo is a 1981 Italian comedic motion picture directed by Mario Monicelli, starring Alberto Sordi as the title character. The film depicts early nineteenth-century episodes in the life of a nobleman in Rome. Loosely based on folkloric accounts of the real Onofrio del Grillo, this character plays a number of pranks, one even involving Pope Pius VII. The famous line Io sò io, e voi non siete un cazzo, is appropriated from Belli's 1831 sonnet, "The Sovrans of the Old World".