A timeline of all major events in the Halo universe from the time of the Forerunners through the rule of the Created.
2142 CE
In 2142 CE, the Unggoy were discovered on their homeworld of Balaho by the Covenant and forcibly added to their list of member species.
2462 CE
Following years of abuse of Unggoy at the hands of the Kig-Yar culminating in the sterilization of thousands via poisoning, the Unggoy Rebellion began in 2462 to protest their treatment by the Kig-Yar and the Covenant as a whole.
~2470 - 2480 CE
Sometime prior to the Jiralhanae’s inclusion into the Covenant in 2492, a decade-long civil war known as the First Immolation devastated the Brute homeworld of Doisac and reduced the Jiralhanae society to pre-industrial technologies.
2492 CE
In 2492, soon after the end of a devastating civil war between Jiralhanae that caused a total collapse in Jiralhanae society, the Covenant visited the Brute homeworld of Doisac and invited them to join.
1342 CE
In 1342, Covenant ships arrived in the Y’Deio system, the home system of the Kig-Yar, finding a species with a penchant for piracy.
1112 CE
The Yanme’e were discovered by the Covenant during their search for Forerunner artifacts in 1112, sparking a short but violent conflict that eventually ended in the incorporation of the Yanme’e into the Covenant.
2200 BCE - 2100 BCE
The War of Wills was a fierce and prolonged conflict between two factions of the San’Shyuum: The Stoics who wanted to worship Forerunner technology but never use it, and the Reformists who wanted to take advantage of the incredible Forerunner artifacts around the galaxy.
938 BCE - 852 BCE
The War of Beginnings was an eighty-six year conflict between the San’Shyuum Reformists who escaped Janjur Qom after the War of Wills and the Sangheili species between 938 and 852 BCE.
860 BCE
The Skirmish of the Planet of Blue and Red was a conflict between the San’Shyuum and Sangheili during the War of Beginnings in 860 BCE.
852 BCE
The Writ of Union was a declaration of peace between the San’Shyuum and the Sangheili, as well as the formation of the Covenant, signed by both species in 852 BCE.
852 BCE - 791 BCE
The Writ of Union not only formed an alliance between the Sangheili and the San’Shyuum, but also commissioned the construction of a great holy city of the Covenant, known as High Charity.
850 BCE
Following the end of the War of Beginnings, the San’Shyuum undertook an effort to recover additional females for breeding purposes from their homeworld, known as the Mission to Janjur Qom.
850 BCE
The Rending was a planned disassembly of Shield World 0673, also known as the Refuge, by a group rebelling against the formation of the Covenant in 850 BCE.
789 BCE - 784 BCE
The Taming of the Lekgolo was a five-year campaign by the Covenant to first destroy, and later incorporate the Lekgolo into the Covenant hierarchy from 789 to 784 BCE.
