Macedonia or Macedon (from Greek: Μακεδονία, Makedonía) was an ancient Greek kingdom. The kingdom, centered in the northeastern part of the Greek peninsula,[1] was bordered by Epirus to the west, Paeonia to the north, the region of Thrace to the east and Thessaly to the south. The rise of Macedon, from a small kingdom at the periphery of Classical Greek affairs, to one which came to dominate the entire Hellenic world, occurred under the reign of Philip II. For a brief period, after the conquests of Alexander the Great, it became the most powerful state in the world, controlling a territory that included the former Persian empire, stretching as far as the Indus River; at that time it inaugurated the Hellenistic period of Ancient Greek civilization.