Euclid (ca 300 B.C.) was a Greek mathematician, who appears to have been educated in Athens by pupils of Plato. Euclid later founded a school of mathematics in Alexandria.
His major work is the Elements, a 13–volume work on mathematics. Many other books have been attributed to Euclid, but with some disagreement among historians as to their actual authorship. These include the Division of the Scale, a discussion of music in mathematical terms, and Data, a presentation of geometric theorems. Euclid’s Elements remained a major text for some 2000 years, and some sections are still used today for high school teaching of plane geometry. (Can you imagine writing a textbook that is still in use 2000 years later?)