Euclid of Alexandria a Greek mathematician who lived about 300 B.C. He is called the Father of Geometry. Euclid profited by work done in geometry by the Egyptians and others for more than a thousand years before his time. He rearranged and systematized the knowledge of others. His 13-volume Elements was used as a textbook in almost unchanged form for more than 2,000 years, and is still a basic source. It deals with plane and solid geometry, proportion, and properties of numbers.

There is little definite information about Euclid's life. He is known to have conducted a school of mathematics in Alexandria during the reign of Ptolemy I. The first printed edition of the Elements (1482) was in Latin, translated from the Arabic. Sir Henry Billingsley's translation (1570) was the first in English.