66:0.2

About five hundred thousand years ago and concurrent with the appearance of the six colored or Sangik races, Caligastia, the Planetary Prince, arrived on Urantia. There were almost one-half billion primitive human beings on earth at the time of the Prince’s arrival, and they were well scattered over Europe, Asia, and Africa. The Prince’s headquarters, established in Mesopotamia, was at about the center of world population.