Nyx

Nyx (Νύξ in Ancient Greek) was the goddess of Night. She is a shadowy figure in Greek mythology but from the extracts about her, it can be gleaned that she was a figure of great beauty and power. She was the female personification of the night, and a daughter of Chaos. In her chariot, pulled by two dark horses, she carries the mantle of night. Her Roman form is Nox.

History
Nyx was born directly from the void of Chaos, and was the one of the first Protogenoi hence her many siblings. She was married to Erebus (Primordial God of Depth and darkness) who is also her brother and had many children with him. She is an incredibly powerful divine being, as she was a Protogenoi, and has four siblings: Gaea, Phusis, Erebus, and Tartarus. A myth that supports her power is when Hypnos, the minor god of sleep and her son, fled from Zeus because he put him to sleep on Hera's orders, so she could give great misfortune onto Hercules. Zeus found out about his involvement and chased him. Hypnos fled to his mother Nyx whom Zeus obviously respected as he held his anger at bay, not wishing to offend Nyx. Another myth is that Nyx's daughter, Hemera (day) left Tartarus when Nyx entered it, creating night and day. According to some Greek articles Chaos did not exist and Nyx, in fact, was the first divine Entity, promoting her power and importance even more. Her son Moros (Doom) is mysterious as well, and is believed to be omniscient, omnipresent, and omnipotent, as he drives all things to their ends. One example is that Zeus cannot defeat her, another being that the Moirae (Fates) serve him.

Nyx's Children
Nyx had many children:

From Erebus:
 * Hemera (Day) In other myths she is sister of Nyx.
 * Aether (Upper sky)
 * Epiphron (Prudence)
 * Thanatos (Non-violent death)
 * Hypnos (The sleep)

From Partenogenesis (by herself):
 * Hesperides (Nymphs of sunset, in other myths are daughters of Atlas)
 * Momo (Satire)
 * The Moirae (Fates)
 * Apate (Deceit)
 * Ponos (Hard labor)
 * Moros (Doom)
 * Oneroi (the thousand personifications of the dreams)
 * Keres (fates of violent death)
 * Charon (Ferryman of Hades)
 * Philotes (Love and friendship)
 * Geras (Old age)
 * Nemesis (Retribution)
 * Eris (Discord, though most say she is the daughter of Zeus and Hera)
 * Oizys (Distress)
 * Styx (Boundary between life and death. In other myths its daughter of Oceanus and Tethys)
 * Achlys(Death mist)

From Cerberus:
 * Hellhounds

By Ouranos:
 * Lyssa (madness)

Trivia

 * The very first ruler of the cosmos was Erebos who gave the 'scepter' to his wife Nyx and together they ruled everything in creation. Later it was given to Gaea and Ouranos, before it went to Kronos and Rhea and eventually ended up with Zeus and Hera.
 * The symbol of Nyx is a star in a cresant moon which is quite similar the the symbol of modern Islam.