Michelangelo and another young sculptor called Pietro Torrigiano studied sculpture under Bertoldo di Giovanni. Michelangelo had an argument with Torrigiano, who punched him on the nose so that it was badly broken and spoilt his appearance for the rest of his life. Michelangelo sculpted some reliefs (flat panels with raised figures on them). One was ‘’the Battle of the Centaurs’’ which was made for Lorenzo de Medici.