Nyx

Greek mythology has captured people's imaginations for millennia, particularly the stories of love that feature adoring and often tragic couples, some of which produced countless children. Oceanus and Tethys Oceanus and Tethys seem to be one of the few monogamous couples...

Nyx is the is the Ancient Greek goddess of the night.  Unlike her sister, Eos, the goddess of the Dawn, Nyx is a mysterious figure.