Pappus of Alexandria
Pappus of Alexandria (; ; AD) was one of the last great Greek mathematicians of antiquity, known for his "Synagoge" (Συναγωγή) or "Collection" (), and for Pappus's hexagon theorem in projective geometry. Nothing is known of his life, other than what can be found in his own writings: that he had a son named Hermodorus, and was a teacher in Alexandria.