Generations after Alexander, Philip II of Macedon would add new lands to Macedonia, and also reduce neighboring powers such as the Illyrians and Paeonians, who had attacked him when he became king, to semi-autonomous peoples. In Philip's time, Macedonians expanded and settled in many of the new adjoining territories, and Thrace up to the Nestus was colonized by Macedonian settlers. Strabo however testifies that the bulk of the population inhabiting in Upper Macedonia remained of Thraco-Illyrian stock. Philip's son, Alexander the Great, extended Macedonian power over key Greek city-states, and his campaigns, both local and abroad, would make the Macedonian power supreme from Greece, to Persia, Egypt, and the edge of India.