President Sergio Mattarella warned of the danger of a regression to "Caesarist tyranny" as he received an honorary master's degree from the University of Florence's Cesare Alfieri School of Political Science on Tuesday The head of State referred to Italian jurist Silvano Tosi, who was both a student and teacher at the school, and his translation of Alexis de Tocqueville's Democracy in America.     "In 1957 he (Tosi) concluded the preface to his translation of Tocqueville's Democracy in America