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Euclid
Euclid was an ancient Greek mathematician active as a geometer and logician.
His most famous work, Elements, established the foundations of geometry until the 19th century. Thus, he is considered the father of geometry.
Euclid's axioms were so intuitively obvious that no one referred to them as Euclidean for more than two thousand years.
Later, many self-consistent non-Euclidean geometries were found. For example, a consequence of General Relativity