Theon of Alexandria

Life

Little is known about Theon's life. He made predictions and observations of solar and lunar eclipses in 364, which show he was active at that time, and he is said to have lived during the reign of Theodosius I (379–395).

The Suda, a tenth-century Byzantine encyclopedia, calls Theon a "man of the Mouseion". However, both the Library of Alexandria and the original Mouseion saw decline and eventually closed in the third century AD and according to classical historian Edward J. Watts, Theon was probably the head of a school called the "Mouseion", which was named in emulation of the Hellenistic Mouseion that had once included the Library of Alexandria, but which had little other connection to it. Theon's school was exclusive, highly prestigious, and doctrinally conservative. Neither Theon nor his daughter Hypatia seems to have had any connections to the militant Iamblichean Neoplatonists who taught in the Serapeum of Alexandria and instead preferred Plotinian neoplatonism.

Theon was the father of the mathematician Hypatia, who succeeded him as head of his school Theon dedicated his commentary on the Almagest to a boy named Epiphanius, who may have been his son. Also, in his commentary on the Almagest he states that his daughter Hypatia contributed to Book III of the Almagest stating "the edition having been prepared by the philosopher, my daughter Hypatia."

A lunar crater, Theon Junior, now bears Theon's name.