Previously, the local dating systems of the Greek states were used they continued to be used by everyone except the historians , which led to confusion when trying to determine dates. The cycle then repeated itself with the Olympic Games.

Gods Origin Online. New York:

BBC News. The Olympic Games Ancient Greek: Little remains of Eratosthenes' Chronographiae , but its academic influence is clearly demonstrated here in the Roman Antiquities by Dionysius of Halicarnassus.