The Greco-Persian Wars began in 499 BC and lasted until 449 BC, starting when the Achaemenid Empire of Persia conquered the Greek-inhabited region of Ionia in 547 BC. The Persians appointed tyrants to rule each of the Greek cities, which caused trouble. The main source of information on the wars is the Greek historian Herodotus, who wrote his 'Histories' in the 440s-430s BC, trying to trace the origins of the conflict. One significant event was the Ionian Revolt from 499-493 BC, where Greek cities in Asia Minor rebelled against Persian rule due to their dissatisfaction with the tyrants appointed by Persia and the actions of two Miles