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461 BCE
Athens breaks alliance with Sparta
Sparta make alliance with Corinth, who Athens was not on good terms with due to Athens taking some of their land a while back -
460 BCE
Megara forms alliance with Athens
Previously they had been a Peloponnesian city-state, so this annoys Sparta. Athens builds sea walls for Megara. -
458 BCE
Battle at Asopus
The Athenian and Spartan armies meet for the first time. Athens is initially defeated, but eventually regroups and wins, and manages to hold the area for the next ten years. -
457 BCE
Athens takes Aegina
Another previously Peloponessian city-state, which again bothers Sparta -
Period: 451 BCE to 445 BCE
Peace of Callias
Sparta and Athens agree to 5 years of peace -
445 BCE
Thirty Years Peace
Established between Sparta and Athens when neither of them could land a decisive blow to end the other. Concluded the first Peloponnesian war -
478
Delian League Established
Established as an alliance of greek city-states, led by Athens.