Euclid's Facts Euclid was born about 365 BC in Alexandria, Egypt and died about 300 BC. Euclid was best known for his treatise on geometry (The Elements). The long lasting nature of The Elements must make Euclid the leading mathematician of all time. But little is known of Euclid's life except that he taught at Alexandria in Egypt. The Elements Euclid's most famous work is his treatise on geometry called The Elements. The book was a compilation of geometrical knowledge that became the centre of mathematical teaching for 2000 years. Proba ....