Pythagoreanism was the system of esoteric and metaphysical beliefs held by Pythagoras and his followers, the Pythagorean cult, who were considerably influenced by mathematics. Pythagoreanism originated in the 5th century BCE and greatly influenced Platonism. Later revivals of Pythagorean doctrines led to what is now called Neopythagoreanism.
Read more about Pythagoreanism: Two Schools, Natural Philosophy, Cosmology, "Wheel of Birth" and Scientific Contemplation, Vegetarianism, Views On Women, Neopythagoreanism, Influences