2 Antonio Giordano da Venafro was a lawyer and a professor of jurisprudence at the University of Siena. He was long in the employ of Pandolfo Petrucci, prince of Siena. Machiavelli's friend, Francesco Vettori, says that Antonio was the most persuasive man he ever heard. Pandolfo Petrucci was represented by him at the Diet of La Magione, on October 9, 1502.