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Peace of Philocrates (347–345 BC)

In 348 BC, Philip conquered Olynthus and razed it to the ground; then conquered the entire Chalcidice and all the states of the Chalcidic federation that Olynthus had once led. After these Macedonian victories, Athens sued for peace with Macedon. Demosthenes was among those who favoured compromise. In 347 BC, an Athenian delegation, comprising Demosthenes, Aeschines and Philocrates, was officially sent to Pella to negotiate a peace treaty. In his first encounter with Philip, Demosthenes is said to have collapsed from fright.

The ekklesia officially accepted Philip's harsh terms, including the renouncement of their claim to Amphipolis. However, when an Athenian delegation arrived at Pella to put Philip under oath, which was required to conclude the treaty, he was campaigning abroad. He expected that he would hold safely any Athenian possessions that he might seize before the ratification. Being very anxious about the delay, Demosthenes insisted that the embassy should travel to the place where they would find Philip and swear him in without delay. Despite his suggestions, the Athenian envoys, including himself and Aeschines, remained in Pella, until Philip successfully concluded his campaign in Thrace.

Philip swore to the treaty, but he delayed the departure of the Athenian envoys, who had yet to receive the oaths from Macedon's allies in Thessaly and elsewhere. Finally, peace was sworn at Pherae, where Philip accompanied the Athenian delegation, after he had completed his military preparations to move south. Demosthenes accused the other envoys of venality and of facilitating Philip's plans with their stance. Just after the conclusion of the Peace of Philocrates, Philip passed Thermopylae, and subdued Phocis; Athens made no move to support the Phocians. Supported by Thebes and Thessaly, Macedon took control of Phocis' votes in the Amphictyonic League, a Greek religious organisation formed to support the greater temples of Apollo and Demeter. Despite some reluctance on the part of the Athenian leaders, Athens finally accepted Philip's entry into the Council of the League. Demosthenes was among those who adopted a pragmatic approach, and recommended this stance in his oration On the Peace. For Edmund M. Burke, this speech heralds a maturation in Demosthenes' career: after Philip's successful campaign in 346 BC, the Athenian statesman realised that, if he was to lead his city against the Macedonians, he had "to adjust his voice, to become less partisan in tone".