Chaos, also known as Khaos or Aer, was the first primordial deity and ruler of the cosmos, also known as a god of fate, like his daughter Nyx and granddaughters Moirai. Besides being a deity, Chaos is also a shapeless void below even the depths of Tartarus, the realm of his son of the same name. Once one enters Chaos, he or she becomes nothing, dissolved by the void. From Chaos emerged the Protogenoi (in some myths, with Aether).
Chaos was the first primordial deity. He was sometimes considered genderless. The Ancient Greek writer Ovid described Chaos as "a rude and undeveloped mass, that nothing made except a ponderous weight; and all discordant elements confused, were there congested in a shapeless heap."
Chaos was the beginning of creation, the emptiness from whence everything came. From Chaos came the earth, the abyss, the heavens (along with Gaea), darkness, misery and night.