Which historical figure invaded Greece in 338 B.C.E. and unified it under the League of Corinth?

The figure who invaded Greece in 338 B.C.E. and unified it under the League of Corinth was Philip of Macedon. Philip's military and diplomatic strategies enabled him to defeat the Greek city-states at the Battle of Chaeronea, effectively bringing them under his control. His creation of the League of Corinth established a cooperative political body among the Greek states, uniting them for joint action, particularly against Persia.

Philip's reign marked a significant turning point in ancient Greek history, as he was able to bring about a level of unity that had not been seen since the height of the city-state era. His unification efforts laid the groundwork for the future conquests of his son, Alexander the Great, who would expand this unity into a vast empire. This historical context highlights Philip’s importance as a consolidator of power and influence in ancient Greece.