Mathematician:Theon of Alexandria

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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.


Alexandrian (a city in what is now Egypt).


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


  • 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.

Also known as

In Greek: Θέων