Phillip of Macedonia defeated the Greeks because he was a brilliant Military leader.
Phillip used a Phalanx.[a group of warriors that stood together in a square.]
Philips son was Alexander he came to be known as Alexander the Great.He defeated the Persians and legend has it he united the Gordian knot.
Alexander the Great expanded his empire all the way to India before his men would go no further.
Alexander the Great spread Greek culture throughout the world. Time before the conquest of Alexander the Great is known as the Hellenic Period and after Alexander the Great is known as the known as the Hellenistic Period.