Verrocchio is a nickname, signifying the true eye. Andrea's real name was de' Cioni; he is known to fame as Andrea of the true eye, and since he had acquired this style at a time when every eye was true enough, his must have been true indeed. It is probable that he was a pupil of Donatello, who in 1435, when Andrea was born, was forty-nine, and in time he was to become the master of Leonardo: thus are the great artists related. The history of Florentine art is practically the history of a family; one artist leads to the other--the genealogy of genius. The story goes that it was the excellence of the angel contributed by Leonardo to his master's picture of the Baptism of Christ (at the Accademia) which decided Verrocchio to paint no more, just as Ghiberti's superiority in the relief of Abraham and Isaac drove Brunelleschi from sculpture. If this be so, it accounts for the extraordinarily small number of pictures by him. Like many artists of his day Verrocchio was also a goldsmith, but he was versatile above most, even when versatility was a habit, and excelled also as a musician. Both Piero de' Medici and Lorenzo employed him to design their tournament costumes; and it was for Lorenzo that he made this charming David and the boy and the dolphin. His greatest work of all is the bronze equestrian statue of Bartolommeo Colleoni in Venice, the finest thing of its kind in the world, and so glorious and exciting indeed that every city should have a cast of it in a conspicuous position just for the good of the people. It was while at work upon this that Verrocchio died, at the age of fifty-three. His body was brought from Venice by his pupil Lorenzo di Credi, who adored him, and was buried in S. Ambrogio in Florence. Lorenzo di Credi painted his portrait, which is now in the Uffizi--a plump, undistinguished-looking little man. In the David room are also the extremely interesting rival bronze reliefs of Abraham sacrificing Isaac, which were made by Ghiberti and Brunelleschi as trials of skill to see which would win the commission to design the new gates of the Baptistery, as I have told earlier in this book. Six competitors entered for the contest; but Ghiberti's and Brunelleschi's efforts were alone considered seriously. A comparison of these two reliefs proves that Ghiberti, at any rate, had a finer sense of grouping. He filled the space at his disposal more easily and his hand was more fluent; but there is a very engaging vivacity in the other work, the realistic details of which are so arresting as to make one regret that Brunelleschi had for sculpture so little time. In S. Maria Novella is that crucifix in wood which he carved for his friend Donatello, but his only other sculptured work in Florence is the door of his beautiful Pazzi chapel in the cloisters of S. Croce. Of Ghiberti's Baptistery gates I have said more elsewhere. Enough here to add that the episode of Abraham and Isaac does not occur in them.