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V. Panhellenic Monuments of Plataea
Oath. I shall not consider anything of more importance than the life of freedom and I will not abandon my leaders either living or dead, but I will bury all of my allies who have died in battle. And if victorious over the barbarians in war, I will not cause revolution in any of the cities of the Greeks who have fought, and everything which is taken from the barbarians I will tithe. I will not rebuild any of the sanctuaries burned or destroyed by the barbarians but will leave them in ruins as a remembrance to future generations of the impiety of the barbarians.”
There was in antiquity a tradition that the Greeks swore an oath before the battle of Plataea in which they affirmed their resolve to meet the Persians with courage and steadfastness. They agreed to leave in ruins sanctuaries which the Persians destroyed, as a memorialof their impiety. When the army of Xerxes attacked destruction was greatest in Boeotia and Attica, especially on the Athenian Acropolis. The Acropolis was indeed rebuilt and bautified under Pericles, more than a generation after the battle of Plataea, but smaller, less important sanctuaries were apparently still left in ruins. Pausanias (10.35.1-2) describes some of these ruins in Abae and Haliartus in Boeotia and in the lower city of Athens. These ruined sanctuaries are monuments of the invasion of Xerxes and testify to the genuineness of the Oath of Plataea.
After the defeat of Mardonius in 479 B. C.the Greeks made some special arrangements regarding the city of Plataea and their land, in order to commemorate their famous victory. Precisely what these arrangements were is stated only by Plutarch (Aristides 21.1-2) but there are some references to them in other sources.  It is even possible that the terms of the agreement, called the Covenant of Plataea by modern historians, are not correctly given by Plutarch but it is certain that some agreement was made, especially from the testimony of Thucydides.
The trophy probably stood on the battlefield at the spot where the battle was turned and according to Herodotus (9.62,65) the battle was fought near the temple of Eleusinian Demeter. Hence the location of this landmark, coupled with Pausanias’ notice that the trophy was fifteen stades from the city, should be a certain point of reference for the spot where the trophy was erected.
The epigram is also quoted in Anth. Pal. 6,50, where the version is identical with that of Plutarch, De Herodoti malignitate 42, except for rhomei cheiros in line 1 and eleutheron Helladi kosmon in line three.
After the battle of Plataea the Greeks buried their dead on the battlefield in accordance with their usual practice  (cf. no. 4). Herodotus gives the principal evidence for these graves, although his account does not agree in its particulars with that of Pausanias, According to Herodotus each city buried its own dead in one or several polyandria. Sparta made three graves; for the irens, the other Spartiates, and the helots. Athens and Tegea had common graves separately; Megara and Phlius either had separate common graves also or they had one grave together. Herodotus’uage is not precise on this latter point.