In Greek mythology, Iapetus (Greek: Ιαπετος, Iapetos, "wound" or "pierce") was one of the Titans and the Titan of mortality. As a Titan, he was a son of Uranus and Gaea. He married Oceanid Clymene and fathered four children by her: Atlas, Prometheus, Epimetheus, and Menoetius. He was also the father of Buphagus by Thornax and Anchiale.

When Cronus ambushed Uranus, he persuaded Iapetus, Hyperion, Crius, and Coeus to aid him. Cronus had the four of his brothers grab onto their father from the four pillars of the earth to hold him while Cronus castrated him. Iapetus represented the western pillar.

After Cronus was overthrown by Zeus, Iapetus and his brothers were all thrown into Tartarus. However, Pindar and Aeschylus write that the Titans were eventually released from their imprisonment.

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