Citizens from all the over 2,000 Greek city-states were eligible..
Nothing - they competed naked.
The Greek people and Athenians and Spartans competed in the Olympic games of Greek.
They didn't. Greek athletes competed naked.
Ancient Olympics were only open to different greek regions.
It is unsure of exactly all the city states who participated, but here are a few:Rhodes, Croton, Sparta, Elis, Krannon (also known as Thessaly), Smyrna, Sybaris,Syrecuse, Heraia (also known as Arkadia), and Thebes.
Individual entries - had to be a citizen of a Greek city-state.
the first olympic games were in greece and only greek atheltes were involved
One country- Greece.
they used the olympic torch