These two huge bronze doors are the reverse side of the North Doors, realized by Lorenzo Ghiberti for the Baptistery between 1403 and 1424. “North Doors”, the second set made for the Baptistery, echo the pattern of the first doors, made by Andrea Pisano in the 14th century, with both sides divided into twenty-eight panels. The reverse sides of the North doors are thus bronze panels fixed onto a huge wooden frame. The bronze panels are centrally decorated with a circular motive with lion heads, probably an allusion to the “Marzocco” lion, one of the symbols of medieval Florence, still visible today in sculptures and decorations on many civic buildings, such as Palazzo Vecchio and the Loggia della Signoria.