Ultimately, the Forerunner had determined that this knowledge would be capable of crippling galactic civilization and sparking rebellion were it to reach the general public. At that, the that were right It is around the same time that humanity is believed by the Forerunners to have "moved their interstellar civilization outward along the galactic arm", possibly to escape Forerunner control. * 126,740 - The capital, the center of the Forerunner eucumene, is constructed.