Original illustration National Archaeological Museum Athens, Inv. no. 126, the following link leads you directly to the National Museum in Greece (in the last third, please scroll down to the illustrations):
the mother goddess of the Greeks, daughter of Kronos and Rhea, the youthful Triptolemos in the middle, who taught agriculture to humans on Demeter's behalf, as well as Persephone, the daughter of Demeter, a goddess of the dead and the underworld, but also fertility.
Demeter hands on this presentation Triptolemos ears of corn while Persephone blesses him. Persephone was abducted with Zeus´ consent, her father, by the underworld god Hades as his wife. Demeter grieved unspeakably and forbade plant growth until Zeus gave in and allowed Persephone to spend a third of the year on the surface.
The Roman equivalents of Demeter and Persephone are Ceres and Proserpina.
The original relief measuring 2.20 x 1.52 m was found in Eleusis, a suburb of Athens, dated 430 BC.