this is very easy Sparta
In ancient times, Sparta was the leading rival of Athens
It changed over time - Sparta, Athens, Thebes.
The chief rival of Sparta in ancient Greece was Athens. The two city-states represented contrasting cultures and political systems, with Sparta being a militaristic oligarchy and Athens a democratic center of arts and philosophy. Their competition culminated in the Peloponnesian War (431-404 BCE), which ultimately led to Athens's defeat and a brief period of Spartan dominance in Greece.
Athens
militaristic.^ that answer is wrong
It changed over time - Sparta, Athens, Thebes.
Greece
Troy
They all were - a matter of survival as they constantly fought each other. Sparta and Athens led opposing leagues.
Athens had become an intellectual center. Sparta was the warriors of Greece.
Corinth, Thebes, Sparta.
Sparta and Athens vied for supremacy .