Both Sparta and Athens.
No, Ancient Greece was not a city state. city sates were part of Greece
No, Greece is neither a city or a state.
Athens, specifically in its Golden Age.
what was and still is the most popular city-state of Greece
A polis. A polis is a city state and the basic unit in Greece.
What was the last city-state to lead an independent Greece
Greece Greece
city
Sparta
Ares was a god, not a city-state. Not surprisingly he was prominent in the city-state of Sparta.
Sparta city state in Greece
Listed from smallest to largest, they are city > county > state > country