Greek mythology says that Cronus is the god of harvest. His wife was Rhea. Every time she had a child Cronus would eat it because he feared it would succeed him. When the sixth son, Zeus, was born, Rhea hid him and wrapped a rock in cloth and Cronus swallowed it, thinking it was a son. After Zeus grew up, he returned and gave Cronus a potion that made him puke up the other children - Hera, Demeter, Hestia, Poseidon and Hades.
Roman mythology is partly lifted from Greek mythology. Cronus is called Saturn in Roman mythology. Saturn went to Rome and created an age of peace. Romans commemorated this time on the winter solstice by giving each other gifts. Even the slaves were equal to their owners for one night. This is where the christians got christmas.
"Saturn Devouring His Son" by Francisco Goya is my favorite painting.