The Macedonian King referred to in the crossword solution is Philip, a ruler of the ancient kingdom of Macedonia from 359 BC to 336 BC. He was the father of Alexander the Great and is considered one of the most successful ancient Greek military commanders. Philip is credited with unifying the Greek city-states under the Macedonian Empire and expanding its borders to include Thrace, Illyria, and parts of Asia Minor. He also reformed the Macedonian army, introducing new weapons and tactics that would be used by his son to conquer much of the known world.