*15 Eleusinian Mysteries – ancient Greek secret ceremonies performed in Eleusis, in West Attica for honor the goddess Demeter and Persephone. One of the oldest Greek mysteries. The basic myth about Demeter's journey in her search for her daughter Persephone abducted into Hades is accompanied by the myth of Demeter's appearance in Eleusis. The Eleusinian Mysteries took the form of agrarian festivities intended to increase the fertility of the land.