Alexander's Empire The ancient Kingdom of Macedonia, situated in the north of modern Greece, was established by Perdiccas I about 640 B.C. Perdiccas was a Dorian, although the Macedonian tribes included Thracian and Illyrian elements. Originally a semibarbarous and fragmented power, Macedon became tributary to Persia under the Persian kings Darius I and Xerxes I and thereafter struggled to maintain itself against Thracians and other barbarians and against the Greek cities of the Chalcidice as well as Sparta and Athens. A new stage began with Archelaus (d.399 B.C.), who centralized the kingdom with a system of roads and forts;