Lost Jerusalem, previously known as Earth until T.C. 0016, is the third planet from the Sun in the Sol System within the Milky Way galaxy. Although it is never called such, Lost Jerusalem can be thought as being First Jerusalem or Original Jerusalem. In the time of Xenosaga, it is an abandoned deserted wasteland. No one has lived on the planet for thousands of years and no one actually knows its location any more. The planet suddenly vanished due to humanity's lust and greed for absolute power and conquest.