Delphi
In 356 BC the Phocians under Philomelos captured and sacked Delphi, leading to the Third Sacred War (356–346 BC), which ended with the defeat of the former and the rise of Macedon under the reign of Philip II. This led to the Fourth Sacred War (339 BC), which culminated in the Battle of Chaeronea (338 BC) and the establishment of Macedonian rule over Greece.
In Delphi, Macedonian rule was superseded by the Aetolians in 279 BC, when a Gallic invasion was repelled, and by the Romans in 191 BC. The site was sacked by Lucius Cornelius Sulla in 86 BC, during the Mithridatic Wars, and by Nero in 66 AD. Although subsequent Roman emperors of the Flavian dynasty contributed towards to the restoration of the site, it gradually lost importance. In the course of the 3rd century mystery cults became more popular than the traditional Greek pantheon. Christianity, which started as yet one more mystery cult, soon gained ground, and this eventually resulted in the persecution of pagans in the late Roman Empire. The anti-pagan legislation of the Flavian dynasty deprived ancient sanctuaries of their assets. The emperor Julian attempted to reverse this religious climate, yet his "pagan revival" was particularly short-lived. When the doctor Oreibasius visited the oracle of Delphi, in order to question the fate of paganism,he received a pessimistic answer:
Third Sacred War
When Philip returned from Thrace he received both the Athenian and other embassies. The Thebans and Thessalians requested that he take the leadership of Greece, and punish Phocis; conversely, the Phocians, supported by the Spartans and the Athenian delegations, pleaded with Philip not to attack Phocis. Philip, however, delayed making any decisions; "[he] sought by every means not to reveal how he intended to settle things; both sides were privately encouraged to hope that he would do as they wanted, but both were bidden not to prepare for war; a peacefully arranged concordat was at hand"; he also delayed taking the oaths to the Peace of Philocrates. Military preparations were ongoing in Pella during this period, but Philip told the ambassadors that they were for a campaign against Halus, a small Thessalian city which held out against him. He departed for Halus before making any pronouncements, compelling the Athenian embassy to travel with him; only when they reached Pherae did Philip finally take the oaths, enabling the Athenian ambassadors to return home.