Relations between the two people date back from antiquity and well before the Persian invasion of Greece. By the late 6th century BC, the Achaemenid Persian Empire was in control over all of Asia Minor (which included many ethnically Greek areas), as well as many of the Greek islands, Thrace, and the kingdom of Macedonia, the latter two which make up large parts of modern-day northern Greece. There is also the report by Strabo of an Athenian delegation to Persia in 432 BC.