Welcome, blackpen. To clarify waylander's post (sorry, waylander), Greece in the period commonly referred to as the Dark Ages in Europe (late 5th to late 8th centirues AD, roughly) was ruled by the Byzantine Empire. Greece in the 10th century BC was in the middle of its own dark age, which predated the Classical period and the rise of the city-states.
As to info on Greece and world history during this period, you'll probably have to build some background and then extrapolate from there. Check out
this page. It may or may not be helpful--I haven't vetted the links--but it might be a good place to start.
HN