Covenant (Earth-2915)

"Creatures of the Covenant: the path is broad, and we shall walk it side by side!"

- High Prophet of Truth

The Covenant, also referred to as the Covenant Hegemony, was a massive religious hegemony of multiple sapient species that controlled a large portion of the Orion Arm in the Milky Way for thousands of years. Originally a mutual alliance between the san'shyuum and the sangheili, the Covenant expanded to include at six other species united in the worship of the mythified forerunners and the Halo Array.

Ruled by the High Prophet of Truth along with High Prophets Mercy and Regret in 2525, the Covenant waged a genocidal campaign against humanity until they were defeated in December 2552. Despite being one of the most powerful military forces in the known Milky Way galaxy, internal conflict combined with stubborn human resistance were formidable enough to shatter the bonds that held the empire together. This internal conflict broke the Covenant in two, forcing out the sangheili species.

Source

 * https://www.halopedia.org/Covenant