The word "cereal" comes from the name of the Roman goddess Ceres, who was the goddess of agriculture, grain crops, and fertility. Her name is directly linked to the word because she was believed to have taught humans how to grow, harvest, and use grains like wheat and barley, which are essential for making cereals.
Now, in Greek mythology, Ceres is known as Demeter. Demeter was one of the most important goddesses in Greek mythology responsible for the growth of crops and the fertility of the earth. The most famous story connected to Demeter is the myth of her daughter Persephone.
Persephone, the beautiful daughter of Demeter was kidnapped by Hades( the god of the Underworld). He took her to his dark kingdom to make her his queen. When Demeter discovered her daughter was missing she was heartbroken and began searching for her everywhere. In her grief, Demeter neglected her duties and the earth became barren—plants stopped growing and a great famine spread across the land.
Eventually, Zeus (the king of the gods) intervened and told Hades to return Persephone. However, before leaving the Underworld Persephone ate six pomegranate seeds. Because of this she was bound to spend part of each year (usually said to be six months) in the Underworld with Hades and the rest with her mother on earth.
When Persephone was with Demeter the earth flourished and crops grew—this represented spring and summer. When Persephone returned to Hades, Demeter mourned and the earth became cold and barren—representing autumn and winter. This cycle explained the changing seasons.
Because Demeter (Ceres in Roman mythology) was so closely associated with grains and farming, her name became connected to foods made from grains. That’s why we call grain-based foods "cereals."
In simple terms, cereal is named after Ceres, the goddess who was believed to control the growth of grains and crops which are the main ingredients in many of the cereals we eat today.