Omoroca was a member of the technologically advanced race, the Ohnes.
She lived on Earth during the time of Babylon, and opposed the tyranny of the Goa'uld. Belus killed her for her actions, which possibly encouraged the Tau'ri to begin their rebellion against the Goa'uld. She was married to another Ohnes named Nem, who would try to find out what happened to her on Earth for 4,000 years. Nem went so far that he almost killed Daniel Jackson trying to retrieve the information about her fate from his mind. She planted the seed of hope for the humans in Earth's distant past. (SG1: "Fire and Water")