Euclid was a Greek mathematician writer who lived around 300 BC. He wrote the most famous math textbook of history. He named his book ‘Elements’.

Elements continued to be used as a standard geometry textbook for 2000 years. Scientific geometry could not advance significantly during this period.

Geometry that is taught at secondary schools still bears the name of Euclid. It is called Euclidean Geometry. More advanced non-Euclidean geometries began much later during the 19th century.