|The greatest of Greek philosophers was born the son of Nicomachus, physician to the king of Macedon, Amyntas II. His father died when Aristotle was a boy, so Aristotle was brought up by a guardian, Proxenus. He was sent to the school of Plato in Athens at age 18 (c. 367 B.C.), where he spent 20 years learning and teaching the philosophical and scientific ideas of the time. Following Plato's death in 347, Aristotle opened a school of philosophy at the court of Hermias, King of Atarneus in Mysia, Assos, who had also been a student at Plato's Academy. Aristotle married Hermias's adopted daughter. After about three years there, Aristotle moved to the island of Lesbos. Following this period, he was hired as a tutor to the young Alexander, son of Philip II of Macedon, and the future Alexander the Great. In 355, he opened a school northeast of Athens--the Lyceum--where he taught for 13 years and wrote many of his major texts. Alexander assisted in financing Aristotle's career there. A year after Alexander's death in 322 and following an anti-Macedonian movement in Athens, Aristotle died in exile. He was the first philosopher to analyze the facets which make up "knowledge," and to dissect the components of knowledge across different disciplines, including the sciences, metaphysics, and psychology. Much of Aristotle's work exists only in fragments or from second-hand accounts, yet a substantial body of work remains on virtually every topic significant to philosophy.