The city of Eleusis is said to derive its name from the hero Eleusis, a fabulous personage deemed by some to have been the offspring of Mercury and Daira, daughter of Oceanus, while by others he was claimed as the son of Oxyges.

Unknown to the parents Demeter used to anoint Demophon by day with ambrosia, and hide him by night in the fire like a firebrand. Detected one night by Metanira, she was compelled to reveal herself as Demeter, the goddess. Whereupon she directed the Eleusinians to erect a temple as a peace-offering, and, this being done, she promised to initiate them into the form of worship which would obtain for them her goodwill and favour. "It is I, Demeter, full of glory, who lightens and gladdens the hearts of gods and men. Hasten ye, my people, to raise, hard by the citadel, below the ramparts, a fane, and on the eminence of the hill, an altar, above the wall of Callichorum. I will instruct you in the rites which shall be observed and which are pleasing to me."

The temple was erected, but Demeter was still vowing vengeance against gods and men, and because of the continued loss of her daughter she rendered the earth sterile during a whole year.

What ails her that she comes not home?
Demeter seeks her far and wide;
And gloomy-browed doth ceaseless roam
From many a morn till eventide.
"My life, immortal though it be,
Is naught!" she cries, "for want of thee,
Persephone—Persephone!"

The oxen drew the plough, but in vain was the seed sown in the prepared ground. Mankind was threatened with utter annihilation, and all the gods were deprived of sacrifices and offerings. Zeus endeavoured to appease the anger of the gods, but in vain. Finally he summoned Hermes to go to Pluto and order him to restore Persephone to her mother. Pluto yielded, but before Persephone left she took from the hand of Pluto four pomegranate pips which he offered her as sustenance on her journey. Persephone, returning from the land of shadows, found her mother in the temple at Eleusis which had recently been erected. Her first question was whether her daughter had eaten anything in the land of her imprisonment, because her unconditional return to earth and Olympos depended upon that. Persephone informed her mother that all she had eaten was the pomegranate pips, in consequence of which Pluto demanded that Persephone should sojourn with him for four months during each year, or one month for each pip taken. Demeter had no option but to consent to this arrangement, which meant that she would enjoy the company of Persephone for eight months in every year, and that the remaining four would be spent by Persephone with Pluto. Demeter caused to awaken anew "the fruits of the fertile plains," and the whole earth was re-clothed with leaves and flowers. Demeter called together the princes of Eleusis—Triptolemus, Diocles, Eumolpus, Polyxenos, and Keleos—and initiated them "into the sacred rites—most venerable—into which no one is allowed to make enquiries or to divulge; a solemn warning from the gods seals our mouths."

Although secrecy on the subject of the nature of the stately Mysteries is strictly enjoined, the writer of the Homeric Hymn to Demeter makes no secret of the happiness which belonged to all who became initiates: "Happy is he who has been received unfortunate he who has never received the initiation nor taken part in the sacred ordinances, and who cannot, alas! be destined to the same lot reserved for the faithful in the darkling abode."

The earliest mention of the Temple of Demeter at Eleusis occurs in the Homeric Hymn to Demeter, which has already been mentioned. This was not written by Homer, but by some poet versed in Homeric lore, and its probable date is about 600 B.C. It was discovered a little over a hundred years ago in an old monastery library at Moscow, and now reposes in a museum at Leyden.

In this Homeric Hymn to Demeter, Persephone gives her own version of the incident as follows: "We were all playing in the lovely meadows—Leucippe, and Phaino, and Electra, and Ianthe, and Melitê, and Iachê and Rhodeia, and Callinhoe, and Melobosis, and Ianeira, and Acastê, and Admetê, and Rhodope, and Plouto, and winsome Calypso, and Styx, and Urania, and beautiful Galaxamê. We were playing there and plucking beautiful blossoms with our hands; crocuses mingled, and iris, and hyacinth, and roses, and lilies, a marvel to behold, and narcissus, that the wide earth bare, a wile for my undoing. Gladly was I gathering them when the earth gaped beneath, and therefrom leaped the mighty prince, the host of many guests, and he bare me against my will, despite my grief, beneath the earth, in his golden chariot; and shrilly did I cry."

The version of the legend given by Minucius Felix is as follows: "Proserpine, the daughter of Ceres by Jupiter, as she was gathering tender flowers in the new spring, was ravished from her delightful abode by Pluto; and, being carried from thence through thick woods and over a length of sea, was brought by Pluto into a cavern, the residence of departed spirits, over whom she afterwards ruled with absolute sway. But Ceres, upon discovering the loss of her daughter, with lighted torches and begirt with a serpent, wandered over the whole earth for the purpose of finding her, till she came to Eleusis; there she found her daughter, and discovered to the Eleusinians the plantation of corn."

According to another version of the legend, Neptune met Ceres when she was in quest of her daughter, and fell in love with her. The goddess, in order to escape from his attentions, concealed herself under the form of a mare, when the god of the sea transformed himself into a horse to seduce her, with which act she was so highly offended that after having washed herself in a river and reassumed human form, she took refuge in a cave, where she lay concealed. When famine and pestilence began to ravage the earth, the gods made search for her everywhere, but could not find her until Pan discovered her and apprised Jupiter of her whereabouts. This cave was in Sicily, in which country Ceres was known as the black Ceres, or the Erinnys, because the outrages offered her by Neptune turned her frantic and furious. Demeter was depicted in Sicily as clad in black, with a horse's head, holding a pigeon in one hand and a dolphin in the other.