Heliopolis (ancient Egypt) from him the true length of the year and month, upon which he formed his octaeterid, or period of 8 years or 99 months. Ptolemy II had Manetho, 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,
Economy of ancient Tamil country and arrow of the Cheras; some of them contain portraits and written legends. Numismatists have used these coins to establish the existence of the Tamil kingdoms during the Sangam age and associate the kings mentioned in the legends to a specific period. A large number of Roman coins have been found in Coimbatore and Madurai districts, providing more evidence for the brisk maritime trade between Rome and Tamilakam. Economy of ancient Tamil country The economy of the ancient Tamil country (Sangam era: 200 BCE – 200 CE) describes the ancient economy of a region in southern India that mostly covers