A portrait of Renaissance political philosopher Niccolò Machiavelli in a French chateau may belong to Renaissance genius Leonardo Da Vinci, some art experts claim. #Macchiavelli portrait in French chateau could be by #LeonardoDaVincihttps://t.co/nDPWmW6quc — Ansa English News (@ansa_english) October 30, 2019 The director of the Chateau of Valencay, one-time seat of French diplomat Talleyrand, has…