This peace—negotiated during the autumn and winter succeeding the defeat of the Athenians at Amphipolis, wherein both Kleon and Brasidas were slain—resulted partly from the extraordinary anxiety of the Spartans to recover their captives who had been taken at Sphakteria, partly from the discouragement of the Athenians, leading them to listen to the peace-party who acted with Nikias. The general principle adopted for the peace was, the restitution by both parties of what had been acquired by war, yet excluding such places as had been surrendered by capitulation: according to which reserve the Athenians, while prevented from recovering Platæa, continued to hold Nisæa, the harbor of Megara. The Lacedæmonians engaged to restore Amphipolis to Athens, and to relinquish their connection with the revolted allies of Athens in Thrace; that is, Argilus, Stageirus, Akanthus, Skôlus, Olynthus, and Spartôlus. These six cities, however, were not to be enrolled as allies of Athens unless they chose voluntarily to become so, but only to pay regularly to Athens the tribute originally assessed by Aristeidês, as a sort of recompense for the protection of the Ægean sea against private war or piracy. Any inhabitant of Amphipolis or the other cities, who chose to leave them, was at liberty to do so, and to carry away his property. Farther, the Lacedæmonians covenanted to restore Panaktum to Athens, together with all the Athenian prisoners in their possession. As to Skiônê, Torônê, and Sermylus, the Athenians were declared free to take their own measures. On their part, they engaged to release all captives in their hands, either of Sparta or her allies; to restore Pylus, Kythêra, Methônê, Pteleon, and Atalantê; and to liberate all the Peloponnesian or Brasidean soldiers now under blockade in Skiônê. Provision was also made, by special articles, that all Greeks should have free access to the sacred Pan-Hellenic festivals, either by land or sea; and that the autonomy of the Delphian temple should be guaranteed. The contracting parties swore to abstain in future from all injury to each other, and to settle by amicable decision any dispute which might arise.[1] [1] Thucyd. v, 17-29. Lastly, it was provided that if any matter should afterwards occur as having been forgotten, the Athenians and Lacedæmonians might by mutual consent amend the treaty as they thought fit. So prepared, the oaths were interchanged between seventeen principal Athenians and as many principal Lacedæmonians.