On the small wall that seperates the loggia from the stairs leading to the prison, are the old Florentine units of measure, "The Staio" and "Mezzo Staio" which were used to measure dry goods, the "Braccio Fiorentino" for length and the "Coltello" (literally the "knife") which was the permitted length of a weapon that the townspeople were allowed to carry on their person. The stone column with the coats of arms of the Florentine Medici family was erected in 1548 to honour the visit of Cosimo I de' Medici, the first Grand Duke of Tuscany.