Today's word from mythology,
cereal, comes from the name of the Roman goddess of agriculture,
Ceres, called Demeter by the Greeks. In the Roman religious calendar, her festival, the Cerealia, was celebrated on April 10. You can read more about Ceres/Demeter at
Wikipedia.
The use of the word "cereal" to refer to breakfast cereal is an American usage dating to 1899.
This
vase painting of Demeter dates to the 4th century B.C.E.