Plutarch, Aristides
Bernadotte Perrin, Ed.

After this, there was a general assembly of the Hellenes, at which Aristides proposed a decree to the effect that deputies and delegates from all Hellas convene at Plataea every year, and that every fourth year festival games of deliverance be celebrated—the Eleutheria; also that a confederate Hellenic force be levied, consisting of ten thousand shield, one thousand horse, and one hundred ships, to prosecute the war against the Barbarian; also that the Plataeans be set apart as inviolable and consecrate, that they might sacrifice to Zeus the Deliverer in behalf of Hellas. [2]

These propositions were ratified, and the Plataeans undertook to make funeral offerings annually for the Hellenes who had fallen in battle and lay buried there. And this they do yet unto this day, after the following manner. On the sixteenth of the month Maimacterion (which is the Boeotian Alalcomenius), they celebrate a procession. This is led forth at break of day by a trumpeter sounding the signal for battle; [3] wagons follow filled with myrtle-wreaths, then comes a black bull, then free-born youths carrying libations of wine and milk in jars, and pitchers of oil and myrrh (no slave may put hand to any part of that ministration, because the men thus honored died for freedom); [4] and following all, the chief magistrate of Plataea, who may not at other times touch iron or put on any other raiment than white, at this time is robed in a purple tunic, carries on high a water-jar from the city's archive chamber, and proceeds, sword in hand, through the midst of the city to the graves; [5] there he takes water from the sacred spring, washes off with his own hands the gravestones, and anoints them with myrrh; then he slaughters the bull at the funeral pyre, and, with prayers to Zeus and Hermes Terrestrial, summons the brave men who died for Hellas to come to the banquet and its copious draughts of blood; next he mixes a mixer of wine, drinks, and then pours a libation from it, saying these words: ‘I drink to the men who died for the freedom of the Hellenes.’ These rites, I say, are observed by the Plataeans down to this very day.