The Greco-Persian Wars were a series of conflicts between Greek city-states and the Persian Empire, beginning in 502 BCE and running some 50 years, until 449 BCE. The seeds for the wars was planted in 547 BCE when the Persian emperor, Cyrus the Great, conquered Greek Ionia. Before this, the Greek city-states and the Persian Empire, centered in what is now modern-day Iran, had maintained an uneasy coexistence, but this expansion by the Persians would eventually lead to war.
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