In Greek mythology Hemera (; "day") was the personification of day and one of the Greek primordial deities. She is the goddess of the daytime and, according to Hesiod, the daughter of Erebus and Nyx (the goddess of night). Hemera is remarked upon in Cicero's De Natura Deorum, where it is logically determined that Dies (Hemera) must be a god, if Uranus is a god. The poet Bacchylides states that Nyx and Chronos are the parents, but Hyginus in his preface to the Fabulae mentions Chaos as the mother/father and Nyx as her sister.