What role did Thebes play in this period of unrest of among the city-states?

Thebes played a crucial role during the period of unrest among the Greek city-states, particularly in the aftermath of the Peloponnesian War. It emerged as a significant military power, often challenging the dominance of Athens and Sparta. Thebes led several alliances, such as the Boeotian League, to counterbalance Spartan influence, and its victory at the Battle of Leuctra in 371 BCE marked a turning point, diminishing Spartan power and elevating Theban prestige. This shift contributed to a more fragmented and competitive political landscape among the city-states.