Theon of Alexandria Theon of Alexandria Theon of Alexandria (; ; 335 – c. 405) was a Greek scholar and mathematician who lived in Alexandria, Egypt. He edited and arranged Euclid's "Elements" and wrote commentaries on works by Euclid and Ptolemy. His daughter Hypatia also won fame as a mathematician. Little is known about the life of Theon. He made predictions and observances 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 biographical tradition of the tenth century Byzantine "Suda" defines Theon
Reign: The Conqueror prefer to create there, Alexandria. Alexander has a vision of himself being in Alexandria 100 years after his death where he visits the place where he was entombed by Ptolemy. Before leaving Egypt Alexander and his men visit the Temple of Ammon where they are told that Alexander will be killed by the one he trusts the most. Ptolemy witnesses a separate prophecy, that he will become Great King of the World. Plotting with Persia, Pythagorean cult members make another attempt on Alexander's life but he is able to fight them off. Darius leads Persia's armies against Macedonia's. Aristotle meanwhile