Ad: anno domini (in the year of the lord) Bce: before the common era: years countdown, e. g. Bce, ce, and bc all go after the year (e. g. 2012 ce) Ad goes before the year (e. g. ad 2012) End of the archaic period end of the persian war. Hellenistic period following the period of alexander the great. 323 bce death of alexander the great: there are great places that aren"t exactly in greece, but carry greek language and culture. Imperial period first settlement of roman empire (augustus was first roman empire) Later roman empire: 284 ce excision of diocletian changed the roman government, 476 ce last roman empire. The franchthi cave in peloponnesus was inhabited continuously from 20,000-3000 bce: the first evidence of agriculture and the domestication of animals at the cave dates to 6000 bce. Archeological evidence suggests the arrival of agriculture form the middle east rather than independently developed in greece.