This first part of a two-part episode examines the art and career of the extraordinary sculptor who is best known as the master of Leonardo da Vinci. Although often overshadowed by the notoriety of his pupil, Verrocchio was one of the most significant sculptors in history.  He was also one of the most influential artists of the Renaissance as other of his pupils included Domenico Ghirlandaio and Pietro Perugino, who in turn were masters to Michelangelo and Raphael, respectively.