Leonardo da Vinci was an Italian polymath who lived from 1452 to 1519. He is famous for his paintings such as the Mona Lisa and The Last Supper. He was also a scientist and inventor who made many detailed observations and drawings on topics like anatomy, astronomy, and engineering. Some of his most important relationships were with his teacher Verrocchio and his pupils Melzi and Salai. His paintings are renowned for their mastery of techniques like sfumato shading and linear perspective. He also kept extensive journals documenting his scientific studies and inventions.