Hemera is the Greek goddess of day. She was born from Erebus, darkness, and Nyx, night. Nyx was the daughter of Chaos, and sister of Erebus. Erebus was among the first beings, dwelling in Hades. He sprang from Chaos at the beginning of time. Erebus' name was given to the gloomy underground cavern which the dead walk through on their way to the Underworld. Hemera emerged from Tartarus as Nyx left it and returned to as she was emerging from it. Thalassa, the sea, is the daughter of Hemera and her brother Aether, light.