Presocratic philosopher, Old Earth, circa 2550/2540 to 2470 BT (580/570-500 b.c.e.). Founder of a major school of religious philosophy that emphasized the mystical interconnections in numbers, nature, and the human soul, on the basis of geometric ratios, musical chords, etc. He considered the natural and the ethical world to be inseparable. Pythagoras had a great influence on later thinkers, including Plato and Kepler. His vision of correspondences in the natural and spiritual world, albeit greatly modified, is still influential in parts of the Sophic League today.