Pythagoras
Pythagoras (c. 580-500 BO. Greek philosopher. He founded a religious society in Croton in southern Italy, already an area of Greek colonization. Although Pythagoras left no writings himself, the doctrines of the Pythagoreans survived his death. These include the theory of the reincarnation of the soul and important studies of mathematics. Pythagoras is best known, to the layman for his theorem stating that the square on the hypotenuse of a right-angled triangle is equal to the sum of the squares on the other two sides.