# Mathematician:Theon of Alexandria

## Mathematician

Alexandrian mathematician and astronomer.

Best known for being the father of Hypatia of Alexandria.

His edition of Euclid's The Elements was an authority until well into the $19$th century.

Not to be confused with Theon of Smyrna, known as Theon Senior or the old Theon.

## Nationality

Alexandrian (a city in what is now Egypt).

## History

• Born: c. 335 CE, possibly in Alexandria, Egypt
• Died: c. 405 CE

## Publications

• c 364: Produced an edition of Euclid's The Elements.
• Produced commentaries on Euclid's Data and Optics.
• Produced a important commentary on Ptolemy's Almagest, and two on his Handy Tables.
• A detailed treatise on the astrolabe.
• Catoptrica, which was at one point thought to have been written by Euclid.

In Greek: Θέων