Leonardo da Vinci (1452-1519), a Florentine by birth and training, was patronized in turn by the Sforza family of Milan, by the Medici of Florence, and by the French royal line. His great paintings--the Holy Supper and Madonna Lisa, usually called La Gioconda--carried to a high degree the art of composition and the science of light and shade and color. In fact, Leonardo was a scientific painter--he carefully studied the laws of perspective and painstakingly carried them into practice. He was also a remarkable sculptor, as is testified by his admirable horses in relief. As an engineer, too, he built a canal in northern Italy and constructed fortifications about Milan. He was a musician and a natural philosopher as well. This many-sided man liked to toy with mechanical devices. One day when Louis XII visited Milan, he was met by a large mechanical lion that roared and then reared itself upon its haunches, displaying upon its breast the coat-of-arms of France: it was the work of Leonardo da Vinci. Leonardo influenced his age perhaps more than any other artist. He wrote extensively. He gathered about himself a large group of disciples. And in his last years spent in France, as a pensioner of Francis I, he encouraged painting in that country as well as in Italy. Michelangelo (1475-1564), Florentine like Leonardo, was probably the most wonderful of all these artists because of his triumphs in a vast variety of endeavors. It might almost be said of him that "jack of all trades, he was master of all." He was a painter of the first rank, an incomparable sculptor, a great architect, an eminent engineer, a charming poet, and a profound scholar in anatomy and physiology. Dividing his time between Florence and Rome, he served the Medici family and a succession of art-loving popes. With his other qualities of genius he combined austerity in morals, uprightness in character, a lively patriotism for his native city and people, and a proud independence. To give any idea of his achievements is impossible in a book of this size. His tomb of Julius II in Rome and his colossal statue of David in Florence are examples of his sculpture; the cathedral of St. Peter, which he practically completed, is his most enduring monument; the mural decorations in the Sistine Chapel at Rome, telling on a grandiose scale the Biblical story from Creation to the Flood, are marvels of design; and his grand fresco of the Last Judgment is probably the most famous single painting in the world. [Sidenote: Raphael]