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During whose reign did Euclid teach in Alexandria?
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Euclid
Euclid, coloured woodcut, 1584. His Elements, a treatise on geometry and mathematics, is one of the most influential books ever written.
According to the Greek philosopher Proclus, the mathematician Euclid taught in Alexandria during the reign of Ptolemy I Soter, who ruled Egypt from 323 to 285 BCE.1