But grief yet more terrible and savage came into the heart of Demeter, and thereafter she was so angered with the dark-clouded Son of Cronos that she avoided the gathering of the gods and high Olympus, and went to the towns and rich fields of men, disfiguring her form a long while. And no one of men or deep-bosomed women knew her when they saw her, until she came to the house of wise Celeus who then was lord of fragrant Eleusis. Vexed in her dear heart, she sat near the wayside by the Maiden Well, from which the women of the place were used to draw water, in a shady place over which grew an olive shrub. And she was like an ancient woman who is cut off from childbearing and the gifts of garland-loving Aphrodite, like the nurses of king's children who deal justice, or like the house-keepers in their echoing halls.
Source: The Homeric Hymns and Homerica with an English Translation by Hugh G. Evelyn-White. Homeric Hymns. Cambridge, MA.,Harvard University Press; London, William Heinemann Ltd. 1914.
This story is at the core of the Eleusinian Mysteries, one of the most famous religious rites of Ancient Greece.
My question is, why Eleusis? Did the city - or the "Maiden Well" - have any religious significance before it was associated with Demeter?