Chronography became a discipline of its own during the Alexandrian age. Herodotus and Thucydides still reckoned the remote past by generations. But from 300 B.C. onward learned men of Alexandria attempted to assign more or less precise dates for notable events. Homeric scholars dated the fall of Troy 407 years prior to the first Olympic games in 776 B.C., i.e., 1184 B.C. Eratosthenes of Cyrene asserted that this was the first datable event of human history, giving an unmistakable demarcation line between mythology and history. For the Orientals, whose records reputedly went back to the time when gods and semi-gods held sway over man, Eratosthenes' Greek-colored view of ancient history appeared myopic. Perhaps to match the Orientals, Greek writers manufactured genealogical tables which traced the pedigrees of famous Greek cities to remote antiquity with their autochthonous progenitors. To create order among the conflicting claims, during the second century B.C., the universal chronicle made its appearance. In the universal chronicles the Greek and Oriental genealogical lists followed each other, were synchronized, or even tabulated.