In Greek mythology, Iapetus was Pandora’s father-in-law according to the story of Prometheus and Epimetheus.
Pandora is presented as the wife of Epimetheus, the Titan associated with hindsight and the brother of Prometheus. Both brothers are sons of the Titan Iapetus and the Oceanid Clymene in the genealogical tradition used by Hesiod. Pandora therefore enters the family of Iapetus through her marriage to Epimetheus.
This relationship is easy to miss because the myth focuses on Pandora’s creation and the opening of the jar rather than on a detailed family tree. Prometheus’s role is central: he deceives Zeus and steals fire for humanity, prompting Zeus to send Pandora as a punishment.
Different ancient sources can vary in divine genealogies and names. Iapetus, however, is the standard father of Prometheus and Epimetheus in Hesiod’s account and in most summaries of the myth.