History of the Covenant

The Covenant, like almost all cultures, keeps a record of their history using their own methods of timekeeping. Unfortunately, the exact measures, if any, of these are a mystery, and there are hints that there may be multiple divisions of each age (9th Age of Reclamation, for example.) What is known is that the Covenant divide their recorded time into seven Ages, divided based on notable events within each.

It is speculated that the Age of Reclamation will be the last of the ages, when the Covenant will fracture during their Civil War.

Age of Abandonment
The Covenant traces its history back at least 100,000 years, when an ancient species (not yet comfirmed as aliens) called the Forerunner activated the Halo installations, disappearing from the galaxy. This is referred to as the Age of Abandonment by the Covenant.

Age of Conflict
At some point before the Covenant’s formation, the Sangheili and Prophets waged war against each other, apparently in a power struggle, in what is called the Age of Conflict. The details of this period of time remain unknown.

Ages of Discovery & Reconciliation
What is known is that the Prophets' discovery of ancient Forerunner artifacts during the Age of Discovery, and the end of the war during the Age of Reconciliation , became the foundation on which the Covenant was founded upon. The Prophets promised to find the means of the Forerunners' transcendence and the Elites promised to protect the hierarchy. These ages marked the beginnings of the Covenant, the start of the Covenant’s search for Forerunner artifacts, and presumably the Covenant Writ of Union.

The Covenant ship Truth and Reconciliation that appeared on Alpha Halo may have been named after this time period.

Age of Doubt
The Age of Doubt is speculated to be a period during which many of the Covenant began to lose faith in their mission. It is likely that the Grunt Rebellion took place during this period, necessitating the creation of an Arbiter. The Arbiter, while successful, died as the prophets planned.

The last Age of Doubt, the 29th, ended in 2525 in human counting.

Age of Conversion
These were followed by the Age of Conversion. , where the Covenant started their subjugation of other species in their search for Forerunner artifacts, incorporating them into their society, adding their strengths to their own. It is likely that the Taming of the Hunters occurred during this time period, requiring the creation of another Arbiter, and defeated them only by threating to destroy the homeworld of the Hunters. This period most likely included the incorporation of the Unggoy, Kig-Yar, Yanme’e and Huragok.

There is a good chance that the Age of Conversion happened before the Age of Doubt

Age of Reclamation
The Age of Reclamation was marked by the Human-Covenant War, and the incorporation of the Jiralhanae. The reasons for the war are currently unknown, though the subjugation of the Brutes led in turn to another major event – the Civil War of the Covenant, otherwise known as the Great Schism, with the expulsion of the Sangheili from the Covenant and their (at least grudging ) alliance with the Humans.

It also marks the discovery of several Forerunner installations, such as the Sacred Rings, and the Ark.

The name may originate from the belief that Humans are Reclaimers.

The latest Age of Reclamation, the 9th, started in 2525 by Human counting.

Trivia
not 8th age of Reclemation and then 9th age of Reclamation. but rather: 29th age of Doubt and then 9th age of Reclamation.
 * Covenant do not base their time on one one age coming after another untill all ages of that kind have been over, but they base the age on the state of the Covenant. for instance: