150,000 BCE
From Halopedia, the Halo wiki
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In 150,000 B.C.E (Approx.), humanity is believed by the Forerunners to have "moved their interstellar civilization outward along the galactic arm".[1]
Sources
- ^ Halo: Cryptum, chapter 1: She responded that to the best of Forerunner research, humans had indeed first arisen on Erde-Tyrene, but over fifty thousand years ago had moved their interstellar civilization outward along the galactic arm, perhaps to flee early Forerunner control. Records from those ages were sparse.