Leonardo da Vinci (1452-1519) was an Italian inventor, artist, architect, and scientist. Leonardo was born in Vinci, Italy (near Florence). Early in life, he studied with the artist Andrea del Verrocchio in Florence. During the years 1483-1499, da Vinci worked for the Duke of Milan, inventing mechanical devices for use in warfare and defense. Some of the mechanical devices that he sketches of included flying machines, submarine and weapons such as rapid-firing guns. Da Vinci also designed canals, bridges, cathedrals and other buildings. After studying optics, proportion and anatomy. He had many incredible ideas that were way ahead of his time. Da Vinci wrote "Treatise on Painting," published in 1551. Leonardo is also a famous realistic painter. He painted some famous paintings like the Mona Lias and The Last Supper.