Iacchus

In Greek mythology, Iacchus is an epithet of Dionysus, particularly associated with the Mysteries at Eleusis, where he was considered to be the son of Zeus and Demeter. Iacchus was the torch bearer of the procession from Eleusis, sometimes regarded as the herald of the 'divine child' of the Goddess, born in the underworld, and sometimes as the child itself. Iacchus was called ‘the light bearing star of the nocturnal mysteries’, giving him possible associations with Sirius and Sothis..
See more at Wikipedia.org...

[Greek] The name by which Dionysus was hailed in the Eleusian Mysteries, sometimes equated with Bacchus, although at Eleusis Dionysus was regarded as the son of Zeus and Demeter.

[Greek] The supreme god Greek Orphism and said to be a son of Zeus and Persephone. At the instigation of Hera, Zagreus was torn to pieces by the Titans and when they proceeded to devour him Zeus appeared on the scene. Driving the Titans back with thunderbolts he succeeded in saving the heart and gave it, still beating, to Semele to eat. From her and Zeus the divine child Dionysus, the Greek god of wine, was born.