# Euclid

**Euclid** (/ˈjuːklɪd/; Ancient Greek: Εὐκλείδης – *Eukleídēs*, pronounced [eu̯.kleː.dɛːs]; fl. 300 BC), sometimes called **Euclid of Alexandria**[1] to distinguish him from Euclid of Megara, was a Greek mathematician, often referred to as the "founder of geometry"[1] or the "father of geometry". He was active in Alexandria during the reign of Ptolemy I (323–283 BC). His *Elements* is one of the most influential works in the history of mathematics, serving as the main textbook for teaching mathematics (especially geometry) from the time of its publication until the late 19th or early 20th century.[2][3][4] In the *Elements*, Euclid deduced the theorems of what is now called Euclidean geometry from a small set of axioms. Euclid also wrote works on perspective, conic sections, spherical geometry, number theory, and mathematical rigour.

Euclid | |
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Born | Mid-4th century BC |

Died | Mid-3rd century BC |

Known for | |

Scientific career | |

Fields | Mathematics |