Colleoni died in the year 1475, at the age of seventy-five. Since he left no male representative, he constituted the Republic of S. Mark his heir-in-chief, after properly providing for his daughters and his numerous foundations. The Venetians received under this testament a sum of 100,000 ducats, together with all arrears of pay due to him, and 10,000 ducats owed him by the Duke of Ferrara. It set forth the testator’s intention that this money should be employed in defence of the Christian faith against the Turk. One condition was attached to the bequest. The legatees were to erect a statue to Colleoni on the Piazza of S. Mark. This, however, involved some difficulty; for the proud Republic had never accorded a similar honour, nor did they choose to encumber their splendid square with a monument. They evaded the condition by assigning the Campo in front of the Scuola di S. Marco, where also stands the Church of S. Zanipolo, to the purpose. Here accordingly the finest bronze equestrian statue in Italy, if we except the Marcus Aurelius of the Capitol, was reared upon its marble pedestal by Andrea Verocchio and Alessandro Leopardi.
Colleoni’s liberal expenditure of wealth found its reward in the immortality conferred by art. While the names of Braccio, his master in the art of war, and of Piccinino, his great adversary, are familiar to few but professed students, no one who has visited either Bergamo or Venice can fail to have learned something about the founder of the Chapel of S. John and the original of Leopardi’s bronze. The annals of sculpture assign to Verocchio, of Florence, the principal share in this statue: but Verocchio died before it was cast; and even granting that he designed the model, its execution must be attributed to his collaborator, the Venetian Leopardi. For my own part, I am loth to admit that the chief credit of this masterpiece belongs to a man whose undisputed work at Florence shows but little of its living spirit and splendour of suggested motion. That the Tuscan science of Verocchio secured conscientious modelling for man and horse may be assumed; but I am fain to believe that the concentrated fire which animates them both is due in no small measure to the handling of his northern fellow-craftsman.