 Complete the following phrase:  a branch of the Macedonians invaded Southern Greece towards the end of the second millennium B.C. Upon reaching the Peloponnese the invaders were renamed Dorians, triggering the accounts of the Dorian invasion. For centuries the Macedonian tribes were organised in independent kingdoms, in what is now Central Macedonia, and their role in internal Hellenic politics was minimal, even before the rise of Athens. The Macedonians claimed to be Dorian Greeks Argive Greeks and there were many Ionians in the coastal regions. The rest of the region was inhabited by various Thracian and Illyrian tribes as well as mostly coastal colonies of other Greek states such as Amphipolis, Olynthos, Potidea, Stageira and many others, and to the north another tribe dwelt, called the Paeonians. During the late 6th and early 5th century BC, the region came under Persian rule until the destruction of Xerxes at Plataea. During the Peloponnesian War, Macedonia became the theatre of many military actions by the Peloponnesian League and the Athenians, and saw incursions of Thracians and Illyrians, as attested by Thucydides. Many Macedonian cities were allied to the Spartans both the Spartans and the Macedonians were Dorian, while the Athenians were Ionian, but Athens maintained the colony of Amphipolis under her control for many years. The kingdom of Macedon, was reorganised by Philip II and achieved the union of Greek states by forming the League of Corinth. After his assassination, his son Alexander succeeded to the throne of Macedon and carrying the title of Hegemon of League of Corinth started his 