eretria was rebuilt shortly afterwards and took part with 600 hoplites in the battle of plataea (479 bc). the ancient writer plutarch mentions a woman of eretria, "who was kept by artabanus" at the persian court of artaxerxes, who facilitated the audience that themistocles obtained with the persian king. during the fifth century bc the whole of euboea became part of the delian league, which later became the athenian empire. eretria and other cities of euboea rebelled unsuccessfully against athens in 446 bc. during the peloponnesian war eretria was an athenian ally against her dorian rivals sparta and corinth. but soon the eretrians, along with the rest of the empire, found athenian domination oppressive. when the spartans defeated the athenians at the battle of eretria in 411 bc, the euboean cities all rebelled.