Donato di Niccolò di Betto Bardi (c. 1386 – December 13, 1466), better known as Donatello , was an early Renaissance sculptor from Florence. He studied classical sculpture, and used this to develop a fully Renaissance style in sculpture, whose periods in Rome, Padua and Siena introduced to other parts of Italy a long and productive career. He worked in stone, bronze, wood, clay, stucco and wax, and had several assistants, with four perhaps being a typical number. Though his best-known works were mostly statues in the round, he developed a new, very shallow, type of bas-relief for small works, and a good deal of his output was larger architectural reliefs.