From Halopedia, the Halo wiki
At least 1
In 2485, humanity colonized the Timmerick system, establishing a colony on Ariel. The Covenant attacked Ariel in January 2552, searching for a Forerunner AI called The Knowing. However, due to the efforts of several Orbital Drop Shock Troopers, the AI self-destructed. As a result, the Covenant broke off their invasion and abandoned Ariel.
List of appearances
- Halo: Helljumper (First appearance)