Grain has held a place of importance in civilization back nearly to the beginning of time. Grain became associated with the cycle of death and rebirth. The Sumerian god Tammuz was slain and his lover Ishtar grieved so heartily that nature stopped producing. Ishtar mourned Tammuz, and followed him to the Underworld to bring him back, similar to the story of Demeter and Persephone.
In Greek legend, the grain god was Adonis. Two goddesses, Aphrodite and Persephone, battled for his love. To end the fighting, Zeus ordered Adonis to spend six months with Persephone in the Underworld, and the rest with Aphrodite.