The reckoning by olympiads, or any other fixed æra, was not yet in uſe among the Greeks. The Arundelian marbles were compoſed ſixty years after the death of Alexander the Great, and yet mention not the olympiads, nor any ſtanding æra, but reckon backward from the time then preſent. In the next olympiad, Timæus Siculus wrote a hiſtory down to his own times, according to the olympiads.