Aristotle (Ancient Stageira, 384 BC – Ancient Chalkida, 322 BC) was an ancient Greek philosopher and scientist born in Stageira, Halkidiki, Macedonia. At the age of 17 he entered the Academy of Plato in Athens, where he remained until the age of 37. There he is associated with both Plato himself and Eudoxus, Xenocrates and other thinkers. His works refer to many sciences, such as physics, biology, zoology, metaphysics, logic, ethics, poetry, theater, music, rhetoric, politics etc., and constitute the first integrated system in Western Philosophy. The period of maturity begins with biological research and its conclusions are the first systematization of biological phenomena in Europe. The thought and teachings of Aristotle, briefly described as Aristotelianism, influenced philosophical, theological and scientific thought for centuries until the late Middle Ages.