Leonardo da Vinci was the natural son of a notary, Ser Pier, and he was born at the Castello of Vinci, near Empoli. From the very hour that he was apprenticed to his master, Verrocchio, he proved that he was the superior of his master in art. Da Vinci was one of the most remarkable men who ever lived, because he not only did an extraordinary number of things, but he did all of them well. He was an engineer, made bridges, fortifications, and plans which to this day are brilliant achievements. He was a sculptor, and as such did beautiful work. He was a naturalist, and as such was of use to the world. He was an author and left behind him books written backward, of which he said that only he who was willing to devote enough study to them to read them in that form, was able to profit by what he had written. Finally, and most wonderfully, he was a painter. He had absolute faith in himself. Before he constructed his bridge he said that he could build the best one in the world, and a king took him at his word and was not disappointed by the result. He stated that he could paint the finest picture in the world--but let us read what he himself said of it, in so sure and superbly confident a way that it robbed his statement of anything like foolish vanity. Such as he could afford to speak frankly of his greatness, without appearing absurd. He wrote: "In time of peace, I believe I can equal anyone in architecture, in constructing public and private buildings, and in conducting water from one place to another. I can execute sculpture, whether in marble, bronze, or terra cotta, and in painting I can do as much as any other man, be he who he may. Further, I could engage to execute the bronze horse in eternal memory of your father and the illustrious house of Sforza." He was writing to Ludovico Sforza whose house then ruled at Milan. "If any of the above-mentioned things should appear to you impossible or impracticable, I am ready to make trial of them in your park, or in any other place that may please your excellency, to whom I commend myself in proud humility." Leonardo's experiments with oils and the mixing of his pigments has nearly lost to us his most remarkable pictures. His first fourteen years of work as an artist were spent in Milan, where he was employed to paint by the Duke of Milan, and never again was his life so peaceful; it was ever afterward full of change. He went from Milan to Venice, to Rome, to Florence, and back to Milan where his greatest work was done.