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 or "Nikamam". Stone inscriptions at Mangulam (c. 200 BCE) and pottery inscriptions found at Kodumanal refer to merchant guilds as "nikamam" and the members of the guilds as "nikamattor". These findings suggest that merchant guilds were established at several industrial and trade centres of ancient Tamil country. Many of these merchant associations acted in union in their public activities. They were autonomous, meaning that they enjoyed freedom from state interference but also suffered from the lack of state backing. Merchants were expected to abide by a code of conduct, which was: "Refuse to take more than your due and never