Nicola Pisano
His birth date or origins are uncertain. He was born in Apulia, as the son of "Petrus de Apulia", as stated in the archives of the Cathedral of Siena. Nicola Pisano was probably trained in the local workshops of the emperor Frederick II, and he attended his coronation. Here he was trained to give to the traditional representations more movement and emotions, intertwining Classical and Christian traditions. His only remaining works from this period are two griffon heads with a soft chiaroscuro effect.