The greeks fought a series of wars with the empire.

ionian

hoplite

athenian

persian

The correct answer is Persian

The Medical Wars took place between the Greek peoples (Achaeans, Ionians, Dorians, and Aeolians) and the Persian Fears over the dispute over Ionia in Asia Minor, when the Greek colonies of the region, especially Miletus, attempted to free themselves from Persian rule.

The struggle for independence from the Ionian cities, Greek colonies in Anatolia (region of present-day Turkey), which the Persians in their territorial expansion came to dominate, compromising Greek trade in the East was the main cause of these wars.