Despoina

Despoina (Des-POI-na) is a Greek fertility goddess and the daughter of Poseidon and Demeter. She was worshiped almost exclusively in the Eleusinian Mysteries at Eleusis, and her true name was only known by the priestesses of the Mysteries. She was also thought to be Artemis by some, given that the people of Eleusis seemed to believe Artemis and Apollo were the children of Demeter (and Poseidon).

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Despoina's association with horses comes from her birth story, where Demeter was sought after and wooed by Poseidon when they were both in horse form. Some also stated that she was the twin sister of Arion because of this, who was an immortal horse and the fastest horse alive. [noted -ed]

Greek goddess of horses, also spelled Despoena.

Despoina was not the daughter of Zeus and Demeter as a previous commenter stated. The Greek equivalent of Proserpina was Persephone. Despoina was the daughter of Poseidon and Demeter.

From Indo-European *dem- "house". (from The American Heritage Dictionary of Indo-European Roots)

This was the daughter of Zeus and Demeter, in Greek Mythology, who was made queen of the underworld by Pluto. Her Roman equivalent is Proserpina.

Despoina is also used as a reference for the Mother of Jesus, Maria.