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
Buddhism in the West that he adopted the Buddhist religion. The Buddhist tradition considers Menander as a great benefactor of the Dharma, along with Ashoka. The "Mahavamsa" mentions that during Menander's reign, a Greek elder monk named Mahadharmaraksita led 30,000 Buddhist monks from "the Greek city of Alexandria" (possibly Alexandria on the Caucasus) to Sri Lanka for the dedication of a stupa showing that Greeks took an active part in Indian Buddhism during this period. Greco-Buddhist styles continued to be influential during the Kushan empire. Buddhist gravestones from the Ptolemaic period have also been found in Alexandria in Egypt decorated with depictions of the