An octagonal lantern was added to the pavilion roof around 1150. It was enlarged with a rectangular entrance porch in 1202, leading into the original western entrance of the building, that in the 15th century became an apse, after the opening of the eastern door facing the western door of the cathedral by Lorenzo Ghiberti. On the corners, under the roof, are monstrous lion heads with a human head under their claws. They are early representations of Marzocco, the heraldic Florentine lion (the symbol of Mars, the god of war, the original male protector of Florentia, protecting a lily or iris, the symbol of the original female patron of the town, Flora, the fertile agricultural earth goddess).