490s BC

• After a failed attack on the rebellious island of Naxos in 501 BC (on behalf of the Persians), Aristagoras, to save himself from the wrath of Persia, plans a revolt with the Milesians and the other Ionians. With the encouragement of Histiaeus (his father-in-law and former tyrant of Miletus), Aristagoras, governor of Miletus, induces the Ionian cities of Asia Minor to revolt against Persia, thus instigating the Ionian Revolt and beginning the Greco-Persian Wars between Greece and Persia. The pro-Persian tyrant of Mytilene is stoned to death.
• Miltiades the Younger, the ruler of the Thracian Chersonese, which has been under Persian suzerainty since approximately 514 BC, joins the Ionian revolt. He seizes the islands of Lemnos and Imbros from the Persians.
• Aristagoras seeks help with the revolt against the Persians from Cleomenes I, king of Sparta, but the Spartans are unwilling to respond.

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