Lewis & Short

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Īăpĕtus, i, m., = Ἰαπετός,

  1. I. a Titan, son of Uranos and Gœa, the father of Atlas, Prometheus, and Epimetheus, Hyg. F. praef.; 54; 142; 144; Verg. G. 1, 279; Lact. 2, 10, 7 sq.: satus Iapeto, i. e. Prometheus, Ov. M. 1, 82; called also Iapeti genus, Hor. C. 1, 3, 27.
  2. II. Deriv. Īăpĕtīŏnĭdes, ae, m., a male descendant of Iapetus: Atlas, Ov. M. 4, 632: fratres gemini, i. e. Prometheus and Epimetneus, Claud. Eutr. 2, 49.