In both Greek and Roman mythology, the god associated with agriculture and grain is Demeter in Greek and Ceres in Roman belief. They symbolize the life-giving properties of the harvest and the changing seasons. Both deities are revered for their roles in ensuring fertility for the land, linking them to agricultural cycles and the sustenance of humanity. Their myths emphasize themes of growth, death, and rebirth, especially illustrated in the story of Demeter's daughter, Persephone, whose annual descent into the underworld represents the seasonal cycle.