Euclid (pron-en?ju?kl?d respellEWKlid; lang-grc????????? Eukleid?s), fl. (floruit) 300 BC, also known as Euclid of Alexandria, was a Greek mathematician (Greek mathematics), often referred to as the "Father of Geometry." He was active in Alexandria during the reign of Ptolemy I (323-283 BC). His Elements (Euclids 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. In it, the principles of what is now called Euclidean geometry were deduced from a small set of axioms. Euclid also wrote works on perspective (Perspective (visual)), conic sections, spherical geometry, number theory and rigor (Rigour).

"Euclid" is the anglicized version of the Greek (Greek language) name polytonic????????? — Eukle�d?s, meaning "Good Glory".