Father of Prometheus, Ancestor of Mortal Trouble

Iapetus is a first-generation Titan whose significance is almost entirely genealogical: through his sons by the Oceanid Clymene, Atlas, Menoetius, Prometheus and Epimetheus, he stands as ancestor of the line that both gave humankind its arts and brought it its sufferings. Prometheus's gift of fire and Epimetheus's acceptance of Pandora are the acts that, in Hesiod, fix the mortal condition, so that Iapetus's descendants carry the whole story of human craft and human misery. He himself has no myth beyond his defeat and imprisonment in Tartarus with the other Titans. His name has been compared, on uncertain grounds, with the biblical Japheth, one of Noah's sons and an ancestor of nations, a resemblance that has interested scholars of Indo-European and Near Eastern contact but remains unproven.

Beyond Hesiod, Iapetus appears chiefly as a genealogical marker in later mythographic compilations such as the Bibliotheca attributed to Apollodorus, which repeats and slightly elaborates his family without adding any narrative of his own; the comparison of his name with the biblical Japheth, though still occasionally repeated in popular writing, has found no support among historical linguists and is generally treated today as a coincidence of sound rather than a genuine shared origin.