Aristotle, an ancient philosopher, ancient Greek, one of the great philosophers, scientists and educators in the ancient history of the world, can be called the master of Greek philosophy. He is Plato's student and Alexander's teacher. In 335 BC, he opened a school called Luc Ang in Athens, known as the Peripheral School. Marx once called Aristotle the most knowledgeable figure among ancient Greek philosophers, and Engels called him the "ancient Hegel". As an encyclopedic scientist, he has made contributions to almost every discipline. His writing involves ethics, metaphysics, psychology, economics, theology, politics, rhetoric, natural sciences, pedagogy, poetry, customs, and Athenian law. Aristotle's writings constituted the first extensive system of Western philosophy, including morality, aesthetics, logic and science, politics and metaphysics.