So far as we know,the first person who claimed that natural phenomena could be described by mathematics was:

Question

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Pythagoras is credited with discovering the relationship between the sides of a right-angled triangle, known as the Pythagorean Theorem. He believed that everything in the universe could be explained through numbers and mathematics, and his philosophy influenced later mathematicians and scientists such as Plato and Galileo.

So Far as We Know,the First Person Who Claimed That