From Halopedia, the Halo wiki
2158 was a year in the 2150s in the 22nd century.
- The Frieden movement targets an embassy in the Europan city of Thynia, leveling the structure with military-grade explosives. In response, the United Nations labels the Friedens as terrorists and dispatches UN colonial advisors to Io to help organize policing efforts.
- Halo Mythos - Rise of Humanity, page 47