Battle of Crocus Field
The Third Sacred War (often just called 'the' Sacred War) broke out in 356 BC, and would present Philip with his first real opportunity to expand his influence into the affairs of central and southern Greece. The war was caused by the refusal of the Phocian Confederation to pay a fine imposed on them in 357 BC by the Amphictyonic League, a pan-Greek religious organisation which governed the most sacred site in Ancient Greece, the Temple of Apollo at Delphi. Behind the religious element, there probably lay a display of "realpolitik" in bringing charges against the Phocians, instigated by the Thebans. At this time, Thebes controlled a majority of the votes in the council, and at the autumn meeting in 357 BC, the Thebans were able to have both the Phocians (for the cultivation of the sacred land) and the Spartans (for occupying Thebes some 25 years previously) denounced and fined. Since the fines for both parties were "unjustifiably harsh", the Thebans probably expected neither party to pay, and thus to be able to declare a "sacred war" on either.
Thebes, Greece
In the Third Sacred War (356—346 BC) with its neighbor Phocis, Thebes lost its predominance in central Greece. By asking Philip II of Macedon to crush the Phocians, Thebes extended the former's power within dangerous proximity to its frontiers. The revulsion of popular feeling in Thebes was expressed in 338 BC by the orator Demosthenes, who persuaded Thebes to join Athens in a final attempt to bar Philip's advance on Attica. The Theban contingent lost the decisive battle of Chaeronea and along with it every hope of reassuming control over Greece.