Athens converted the 180 city-state Delian League into an empire of its own, and used the combined resources to interfere in the affairs of the other Greek cities.
Yes.
The Persian Empire .
The Persian Wars
The Persian king, and first Sparta then Athens on the Greek side.
The Persian Wars 490 to 449 BCE.
Persian Wars
The Persian Empire versus a coalition of Greek city-states, at first led by Sparta, then by Athens.
The Persian Empire and an alliance of Greek city-states led first by Sparta and then Athens.
A mutually supportive arrangement to ensure stability.
Two leagues - one led by Athens, the other led by Sparta.
There were over 200, led at first by Sparta, then by Athens.
In the first part, Miletus. In the second part Sparta. In the third part, Athens.