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,
Chronology of the ancient Near East Chronology of the ancient Near East The chronology of the ancient Near East provides a framework of dates for various events, rulers and dynasties. Individual inscriptions and texts customarily record events in terms of a succession of officials or rulers, taking forms like "in the year X of king Y". Thus by piecing together many records a relative chronology is arrived at, relating dates in cities over a wide area. For the first millennium BC, the relative chronology can be tied to actual calendar years by identifying significant astronomical events. An inscription from the tenth year of Assyrian king Ashur-Dan