Through close scrutiny of the surviving fragments of ancient chronography, it is possible to work out the way Eratosthenes, in his lost Chronographiai (ca. 220 BC), arrived at his date for the Fall of Troy (1183 BC) -- a 'universal' reference point in antiquity. By combining new information from Manetho, with Timaeus, Ctesias, Herodotus and other sources, he devised a compromise chronology for the Greek past: 'high' enough to satisfy Hellenistic cultural interests, and 'low' enough to satisfy Alexandrian critical scholarship.What was reckoned originally to be an event of the 10th century BC, and later raised as far as the...