Lorenzo Ghiberti
The Consuls of the Arte di Calimala were entrusted with maintaining the Baptistery of San Giovanni by the mid-twelfth century, according to Giovanni Villani; thus it was the Calimali that commissioned from Lorenzo Ghiberti the gilded bronze doors called the "Gates of Paradise" and the bronze statue of their patron, John the Baptist, for a niche at Orsanmichele.