Prior to the rise of Athens, Sparta considered itself to be the leader (or hegemon) of the Greeks. In 499 BC, Athens sent troops to aid the Ionian Greeks of Asia Minor, who were rebelling against the Persian Empire (the Ionian Revolt). This provoked two Persian invasions of Greece by the Achaemenid Empire. In 490 BC, the Athenians, led by the soldier-statesman Miltiades, defeated the first invasion of the Persians under Darius I at the Battle of Marathon.