And in case you wondered about Nyx (the runner up)

Nyx is Night, a powerful goddess whose dark light falls from the stars, and who dictates not only to men but also to gods. Even Zeus does not wish to upset Night.

According to http://www.loggia.com/myth/nyx.html:

"The goddess Nyx was the personification of Night in Greek mythology. One of the best sources for information about this goddess comes from the Theogony of Hesiod. A great many references are made to Nyx in this poem that describes the birth of the Greek gods and goddesses. And the explanation for this is simple - Nyx played an important role in myth as one of the first divine beings to come into existence.

Hesiod states that Night was the daughter of Chaos, which makes her one of the first creatures ever to emerge from the void. This means that Nyx was the sister to some of the oldest deities in Greek myth, including Erebus (Darkness), Gaia (the Earth), and Tartarus (the Underworld). From these primeval powers came the rest of the Greek gods and goddesses. And Nyx was responsible for bearing her share of divine children.

Nyx gave birth to a number of offspring. Some of these children of Night were Eris (Discord or Strife), the Moirai (Fates), Hypnos (Sleep), Nemesis (Retribution), Thanatos (Death), and the Hesperides. While these beings were born from the goddess alone, without a father, Nyx also had children by the god Erebus. To Erebus the goddess bore Aether (Air) and Hemera (Day)."

I don't really know why, but somehow I find her more intriguing and interesting then Hera...