In Greek mythology, Iapetos is an offspring of Ouranos and Gaia, and is therefore one of the twelve Uranides. The other eleven are: Kronos, Okeanos, Hyperion, Krios, Koios, Rhea, Tethys, Theia, Phoebe, Themis, and Mnemosyne.
Iapetos is the father of the four Iapetionides: Prometheus, Menoitios, Epimetheus, and Atlas.
His name derives from the word iapto (“wound, pierce”) and usually refers to a spear, implying that Iapetus may have been regarded as a god of craftsmanship. However, scholars mostly describe Iapetos as the god of mortality, because his sons Prometheus and Epimetheus were represented as the creators of mankind.
In Hesiod's Theogony, Iapetos’ wife is Klymene, a daughter of Okeanos and Tethys, and she is also the mother of his children.
Being the father of Prometheus, Iapetos was regarded by the Greeks as the ancestor of the human race.
Dictionary of Greek and Roman Biography and Mythology by William Smith