The Greek goddess of corn was Demeter. She was also the goddess of the harvest, earth, agriculture, grain and fertility. Each year, the Greeks sacrificed their first loaves of bread from the harvest to Demeter.
Demeter was the daughter of Rhea and Cronus and mother of Persephone. She was connected to the changing of the seasons. According to mythology, Hades kidnapped Persephone to be his wife and brought her to the Underworld. Demeter was so distraught that she caused plants and vegetation to die. Zeus arranged for Persephone's return, but because she had eaten a pomegranate, Hades held some claim to her. Each year, Persephone spent 4 months in the Underworld, and Demeter's grief over her absence caused winter.