Entry Version: This is the English version of this article translated by Patrick Hogan. The original Italian version was written by Eleonora Rocconi and first published on 14/11/2007. Here is the Italian version of this entry. Grammarian: Name: Theon [3] | Θέων Identity: Perseus | BNP Place of Origin: Smyrna Date: 1st-2nd c. CE ↓ To Source List Biography: Theon was a philosopher and mathematician of Platonic1-Pythagorean2 orientation, but we have only a few scraps of biographical information about him. From Claudius Ptolemaeus’3 astronomical treatise known as the Almagest4 (where T…