Euclid (fl. c. 300 BCE) was an ancient Greek mathematician active chiefly in Alexandria, known as the 'father of geometry.' He is best known for the Elements, a thirteen-book treatise that systematically compiled and rigorously proved the geometric and number-theoretic knowledge of his era, synthesizing the work of earlier mathematicians such as Eudoxus and Theaetetus. The axiomatic method he used in the Elements, now called Euclidean geometry, dominated the teaching of mathematics for more than two thousand years and remains foundational to the subject. Alongside Archimedes, he is considered among the greatest mathematicians of antiquity.
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