On this lake it is that the Egyptians represent by night his sufferings whose name I refrain from mentioning, and this representation they call their Mysteries. I know well the whole course of the proceedings in these ceremonies, but they shall not pass my lips. So too, with regard to the mysteries of Demeter, which the Greek term “the Thesmophoria,” I know them, but I shall not mention them, except so far as may be done without impiety. The daughters of Danaus brought these rites from Egypt, And taught them to the Pelasgic women of the Peloponnese. Afterward, when the inhabitants of the peninsula were driven from their homes by the Dorians, the rites perished. Only in Arcadia, where the natives remained and were not compelled to migrate, their observance continued. (Herodotus, The History II, 171)
The following is a tale which was told by Dicaeus, the son of Theocydes, an Athenian, who was at this time in exile and had gained a good report among the Medes. He declared that after the army of Xerxes had, in the absence of the Athenians, wasted Attica, he chanced to be with Demaratus, the Lacedaemonian in the Thriasian plain, And that while there, he saw a cloud of dust advancing from Eleusis, such as a host of thirty thousand men might raise. As he and his companion were wondering who the men, from whom the dust arose, could possibly be, a sound of voices reached his ear, and he thought that he recognized the mystic hymn to Bacchus, Now Demaratus was unacquainted with the rites of Eleusis, and so he inquired of Dicaeus what the voices were saying. Dicaeus made answer – O Demaratus! Beyond a doubt some mighty calamity is about to befall the king’s army! For it is manifest, inasmuch as Attica is deserted by its inhabitants, that the sound which we have heard is an unearthly one and is now upon its way from Eleusis to aid the Athenians and their confederates. If it descends upon the Peloponnese, danger will threaten the king himself and his land army – if it moves towards the ships at Salamis, ’twill go hard but the king’s fleet there suffers destruction. Every year the Athenians celebrate this feast to the Mother and the Daughter; and all who wish, whether they be Athenians or any other Greeks, are initiated. The sound thou hearest is the Bacchic song, which is wont to be sung at that festival.
“Hush now,” rejoined the other; “And see thou tell no man of this matter. For if thy words be brought to the king’s ear, thou wilt assuredly lose thy head because of them; neither I nor any man living can save thee. Hold thy peace therefore. The gods will see to the king’s army.” Thus Demaratus counseled him; and they looked, and saw the dust, from which the sound arose, become a cloud, and the cloud rise up into the air and sail away to Salamis, making for the station of the Grecian fleet. Then they knew it was the fleet of Xerxes which would suffer destruction. Such was the tale told by Dicaeus the son of Theocydes; and he appealed for its truth to Demaratus and other eye- witnesses. (Herodotus. The History. VIII, 65)
The Persians, as soon as they were put to flight by the Lacedaemonians, ran hastily away, without preserving any order, and took refuge in their own camp, within the wooden defense which they had raised in the Theban territory. It is a marvel to me how it came to pass, that although the battle was fought quite close to the grove of Demeter, yet not a single Persian appears to have died on the sacred soil, nor even to have set foot upon it, while round about the precinct, in the unconsecrated ground, great numbers perished. I imagine – if it is lawful, in matters which concern the gods, to imagine anything – that the goddess herself kept them out, because they had burnt her dwelling at Eleusis. Such, then, was the issue of this battle. The Persians, as soon as they were put to flight by the Lacedaemonians, ran hastily away, without preserving any order, and took refuge in their own camp, within the wooden defense which they had raised in the Theban territory. It is a marvel to me how it came to pass, that although the battle was fought quite close to the grove of Demeter, yet not a single Persian appears to have died on the sacred soil, nor even to have set foot upon it, while round about the precinct, in the unconsecrated ground, great numbers perished. (Herodotus The History IX, 65)