Orpheus, Homer, Pythagoras, Plato, Solon, and other Greek philosophers. From Ichonuphys, who was lecturing there in 308 BC, and who numbered Eudoxus among his pupils, the Greek mathematician learned the true length of the year and month, upon which he formed his octaeterid, or period of eight years or ninety-nine months. Ptolemy II had Manethon, the chief priest of Heliopolis, collect his history of the ancient kings of Egypt from its archives. The later Ptolemies probably took little interest in their "father" Ra, and Alexandria had eclipsed the learning of Heliopolis; thus with the withdrawal of royal favour Heliopolis quickly dwindled, and the students of native lore deserted it for other temples supported by a wealthy population of pious citizens. By the 1st century BC, in fact, Strabo found the temples deserted, and the town itself almost uninhabited, although priests were still present.
Roman era
In Roman times Heliopolis belonged to the Augustamnica province. Its population probably contained a considerable Arabic element. (Plin. vi. 34.) In Roman times obelisks were taken from its temples to adorn the northern cities of the Delta, and even across the Mediterranean to Rome, including the famed Cleopatra's Needle that now resides on the Thames embankment, London (this obelisk was part of a pair, the other being located in Central Park, New York). Finally the growth of Fustat and Cairo, only 6 miles (9.7 km) to the southwest, caused the ruins to be ransacked for building materials. The site was known to the Arabs as ʻAyn Šams ("the well of the sun"), more recently as ʻArab al-Ḥiṣn.
Biblical Heliopolis
Heliopolis was the capital of the Province of Goshen, country that comprised much of the northern Egyptian territory of the Nile Delta. This was one of three main store-city locations that grain was kept during the winter months and during the seven year famine discussed in the Joseph narrative of the Book of
