(“displayer of holy things”), in ancient Greece, chief of the Eleusinian (Eleusinian Mysteries) cult, the best-known of the mystery religions of ancient Greece. His principal job was to chant demonstrations of sacred symbols during the celebration of the mysteries. At the opening of the ceremonies, he proclaimed that all unclean persons must stay away—a rule that he had the right to enforce.

Usually an old, celibate man with a forceful voice, he was selected from the Eumolpids, one of the original clans of the ancient Greek city of Eleusis, to serve for life. Upon taking office he symbolically cast his former name into the sea and was thereafter called only hierophantēs. During the ceremonies he wore a headband and a long, richly embroidered purple robe.