Wikipedia user Marsyas

From 359 BCE, when he succeeded to the Macedonian throne, until 336, when he died, Philip of Macedon (the father of Alexander) expanded the Macedonian kingdom into an empire, an enterprise which brought him into conflict with Athens frequently until 338, when Philip’s victory at the Battle of Chaeronea in Boeotia made him the undisputed master of all Greece. The dangers to which Theomnestos refers in Against Neaira 3 were Philip’s preparations, in summer 348, for a campaign against Thrace and his clear designs on Athenian possessions and colonies in that area. The cities and regions in question are encompassed by this map. (Marilyn Katz)