thumb|upright=1.3|In Raphael's fresco [[The School of Athens, Pythagoras is shown writing in a book as a young man presents him with a tablet showing a diagrammatic representation of music theory on a lyre above a drawing of the sacred tetractys.]]
Pythagoreanism was an ancient philosophical and religious movement founded by or inspired by the Greek mathematician Pythagoras, centered on the pursuit of spiritual purification and the belief that numbers and mathematical relationships held sacred significance in understanding the universe. The movement valued both intellectual inquiry—including studies of mathematics and music theory—and spiritual practices, as reflected in its reverence for mathematical concepts like the tetractys.
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thumb|upright=1.3|In Raphael's fresco [[The School of Athens, Pythagoras is shown writing in a book as a young man presents him with a tablet showing a diagrammatic representation of music theory on a lyre above a drawing of the sacred tetractys.]]
Pythagoreanism originated in the 6th century BC, based on and around the teachings and beliefs held by Pythagoras and his followers, the Pythagoreans. Pythagoras established the first Pythagorean community in the ancient Greek colony of Croton, in modern Calabria (Italy) circa 530 BC. Early Pythagorean communities spread throughout Magna Graecia.
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