whencyclopedia:

IN ancient Greek mythology, Zagreus is a god closely associated with the wine god Dionysus, the underworld, and hunting. A son of Zeus and Persephone, he is known in the Orphic tradition as the first incarnation of Dionysus, whilst other stories identify him as the son of Hades or even as Hades himself.

The earliest mention of Zagreus comes from a quoted line from the lost Greek epic Alcmeonis, a poem dating back to at least the 6th century BCE, where he is described alongside Gaia, the Greek personification of the earth, as “highest of all the gods” (West, 61). Yet some scholars believe this line was only in reference to him being the highest of all the gods of the underworld, as surviving fragments of works written by the Greek tragedy playwright Aeschylus (c. 525 to c. 456 BCE) identify him closely with Hades.

Read More Here