Modena, Galleria Estense: Hercules horse riding; Bertoldo di Giovanni, 1473; bronze.Hercules, after slaying bare-handed the Nemean lion, bears the remains wearing his skin and holding the mouth of the beast. open with his right hand.Bertoldo di Giovanni (Florence, about 1420 - Poggio a Caiano, December 28, 1491) was an Italian sculptor and medalist. Pupil of Donatello, was the first master of Michelangelo.