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In page Eleusinian Mysteries:

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The Ninnion Tablet, found in the same museum, depicts Demeter, followed by Persephone and Iacchus, and then the procession of initiates. Then, Demeter is sitting on the kiste inside the Telesterion, with Persephone holding a torch and introducing the initiates. The initiates each hold a bacchoi. The second row of initiates were led by Iakchos, a priest who held torches for the ceremonies. He is standing near the omphalos while an unknown female (probably a priestess of Demeter) sat nearby on the kiste, holding a scepter and a vessel filled with kykeon. Pannychis is also represented.[citation needed]