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Do you want to clarify to whom and when?

One contribution they made was to the Spartan alliance late in the Peloponnesian War to enable the Spartan alliance to develop a navy which could match the Athenian one, leading to Athens' downfall.

Another contribution was their attempts to bring peace and order to the Western Mediterranean, which was why they invaded peninsular Greece in 480 (unsuccessfully), supported the Spartan alliance in the Peloponnesian War, and finally imposed the King's Peace in 387 BCE to end the endless ongoing wars between the Greek city-states which disrupted the whole region.

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12y ago

What else can I help you with?