Mathematician:Theon of Alexandria

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Greek: Θέων.

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 19th 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.
  • Catoptrica, which was at one point thought to have been written by Euclid.