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  • 150,000 B.C.E. - Humanity starts colonizing other star systems and the move the civilization away from Earth to the outer edges of the Orion Arm, supposedly due to the threat of Forerunner expansion.
  • 100,300 B.C.E. - first contact is made between a Forerunner research team and the Flood on G617 g1. A military team was sent in later after contact had been lost. The Flood escaped the planet, thus beginning the 3-century-long Forerunner-Flood War.
  • 100,043 B.C.E. - the Forerunners created 05-032 Mendicant Bias to combat the Flood threat and Gravemind. Mendicant Bias would eventually turn against his makers and fight for the Gravemind.At the same time the Librarian discovers an early human species on what we now know as Earth. The entire species is removed from the surface of the planet and held on the Ark.
  • 100,000 B.C.E. - The date 100,000. B.C.E was the approximate time when the Forerunners fired the Halos, or what the Covenant refer to as The Great Journey. 343 Guilty Spark put the date as the year 97,448 B.C.E, though it should be noted that he measured it on Installation 04's year, not the 365.251 day Earth calendar.
  • 97,227 B.C.E. - A report is sent to 2401 Penitent Tangent regarding Flood containment failure in one particular facility, urging assistance due to the dangers of a full outbreak. Penitent Tangent ignores this report and protocol despite multiple and more urgent reminders. He continued to ignore this for another 99,779 years, at which point a full outbreak had already occurred, but by then it was too late.
  • 57,448 B.C.E. - a meteor bearing Forerunner symbols crashes on the planet that will be known as Sigma Octanus IV. The meteor will be discovered approximately 60,000 years later, with its contents later reclassified as an important artifact to the Covenant.
  • 2200 B.C.E. - saw a major turning point in the history of the San 'Shyuum (Prophets). After centuries of unity the San 'Shyuum become divided into two groups, the Stoics who believe that Forerunner relics were sacred and not to be altered, and the Reformists who wish to more closely examine the artifacts and use them for their own purposes. This fundamental disagreement sparks the San 'Shyuum Civil War.
  • 2100 B.C.E. - the century-long San 'Shyuum Civil War comes to an end as one thousand Reformists enter the Forerunner Dreadnought and flee the San 'Shyuum homeworld.
  • 938 B.C.E. - the San 'Shyuum first encounter the Sangheili on Sanghelios who, like the Stoics, believe that Forerunner relics are to be worshipped, not modified. This ideological difference results in the Sangheili-San 'Shyuum War, in which the Sangheili have a distinct advantage in infantry combat due to superior numbers and troop quality. However, in space combat the San 'Shyuum have a great advantage because of their Dreadnought.
  • 876 - After decades of struggle between the Sangheili and San 'Shyuum in the Sangheili-San 'Shyuum War, the Sangheili finally accept that they must adapt and study their Forerunner relics or face defeat at the hands of the San 'Shyuum. The Sangheili warrior priests reluctantly begin using their relics to improve their warships, arms and armour.
  • 852 - The Sangheili and San 'Shyuum end their war, merging to form the Covenant. The Council of Concordance ratifies the Writ of Union, clearly defining the roles of the San 'Shyuum and the Sangheili.
  • 784 - During one of the first Ages of Conversion Covenant forces discover the planet Te and with it the Lekgolo.They discover that many of the Lekgolo worm colonies have literally devoured Forerunner artifacts and installations, while others eat everything except Forerunner installations. The Lekgolo initially prove difficult to defeat because of their ability to combine into the powerful Mgalekgolo, however due in part to their superior spaceship technology the Covenant are able to ally with and tame the useful Lekgolo, and exterminate the relic-destroying colonies in what will come to be known as the Taming of the Hunters. The compliant Lekgolo are incorporated into the Writ of Union in 784 B.C.E.
  • 648 - the San 'Shyuum homeworld is destroyed by a natural stellar collapse and the Forerunner Dreadnought is made into the centerpiece of the new space station that will serve as the Covenant's capital, High Charity. It is unknown whether or not the descendants of the Reformer San 'Shyuum had ever physically returned to their homeworld after they left it in 2100 B.C.E. during their schism with the Stoic San 'Shyuum.
  • 480 - In The Battle of Thermopylae of 480 BC, an alliance of Greek city-states fought the invading Persian Empire at the pass of Thermopylae in central Greece. Vastly outnumbered, the Greeks held back the massive army of Persians for three days in one of history's most famous last stands.A small force led by King Leonidas of Sparta blocked the only road through which the massive army of Xerxes I could pass. After three days of battle, a local resident named Ephialtes betrayed the Greeks by revealing a mountain path that led behind the Greek lines. Dismissing the rest of the army, King Leonidas stayed behind with 300 Spartans and 700 Thespian volunteers. The Persians succeeded in taking the pass but sustained heavy losses, extremely disproportionate to those of the Greeks.
  • 1112 - The Yanme'e; a tier 4 civilization, are incorporated into the Covenant as a slave race.
  • 1342 - In 1342 the Covenant discover the Kig-Yar. Although the Kig-Yar initially attempt to resist absorbtion into the alliance they quickly recognize that they are facing a superior force and submit, taking on the role of explorers and traders (and often thieves and smugglers). The Kig-Yar are also motivated by the potential trade and wealth the Covenant can provide.
  • 1552 - In 1552, the San 'Shyuum began developing technologies that could increase their life spans.
  • 1945 - The United Nations is formed on Earth at the end of World War II. The UN eventually forms the UNSC in the 2100s, but the UN begins embarking on military and security operations as early as the 1950s. Fifty-one nations originally signed the UN Charter, which governed the "global association of governments facilitating co-operation in international law, international security, economic development, and social equity." By the beginning of the 21st century, practically all the nation-states on Earth are members of the United Nations.
  • 1995 - David George and Aaron Elliot founded the "Society of the Ancients".
  • 2021 - The International Society of Civil Engineers is established on Earth.
  • 2080 - Humans settle on Luna, Mars, the Jovian moons, and asteroids.
  • 2142 - In early 2142 the Covenant discover the Unggoy homeworld, Balaho.[1] The Unggoy surrender almost immediately in the imposing presence of the Sangheili and are incorporated into the Covenant.


  • 2160 - Jovian secessionist attacks on United Nations Colonial Advisers on the moon Io led to three months of fighting between the Earth military and Jovian "Frieden" forces. Though this was not the first armed conflict in the Sol System, it was easily one of the bloodiest, and is generally considered to be the spark of increased friction and militarization that followed. The Jovian moons campaign escalated tensions, as Earth's national governments, many of which sponsored colonies within the system, began fighting proxy wars off-planet. As these continued, tensions on Earth mounted, leading to a number of armed conflicts on Earth itself.
  • 2162 - The Rain Forest Wars: Armed conflict ripped through South America, as Koslovic, Frieden, and UN forces all clashed over ideological differences, sparking additional conflicts off-planet.
  • 2163 - In a conflict that stemmed from the Rain Forest Wars, the three primary Earth factions clash again, this time on Mars. A series of lightning strikes against Koslovic forces near the Argyre Planitia marks the first extra-terrestrial deployment of Marines. The campaign was deemed an unqualified success. As a result, future military doctrines favor large contingents of Marines for ground assaults and ship-boarding actions.
  • 2164 - UN sponsored military forces begin a pattern of massive build-ups, culminating in the first real interplanetary war. After the successful Marine deployment on Mars, recruitment drives and propaganda tactics strongly bolster UNSC (United Nations Space Command) forces. UN forces defeat Koslovics (supporters of rabid Communist hard-liner Vladimir Koslov) and Frieden (a resurgence of fascism) forces on Earth, and then begin a systematic and dedicated drive to crush their remnants on the various planets they hold throughout the system. At the conclusion, Frieden and Koslovic forces are defeated, in the face of a massive, unified and very powerful UN military.
  • 2170 - The Callisto Treaty is signed. The Frieden and Koslovics formally surrender to the UNSC, officially ending the Interplanetary War.A Unified Earth Government is formed in the wake of the conflicts of the 2160s. Now, the victors were forced to deal with a less obvious but equally serious threat: overpopulation and a massive military that had no enemy to fight. In the post-war period there were massive population surges and the overpopulation, coupled with the destruction and famine bred by the Rain Forest Wars, threatened to destabilize the economy.
  • 2215 - Wallace Fujikawa is born. He will later become the co-creator of the Shaw-Fujikawa Slipspace Drive.
  • 2220 - Tobias Fleming Shaw is born - the co-creator of the Shaw-Fujikawa Slipspace Drive.
  • 2291 - a group of researchers headed by Tobias Shaw and Wallace Fujikawasecretly developed the Shaw-Fujikawa Slipspace Drive, a practical means of propelling spacecraft across vast interstellar distances. This new engine allowed ships to tunnel into "the Slipstream" (also called "Slipspace"). Slipspace is a domain with alternate physical laws, allowing faster-than-light travel without relativistic side effects. Faster-than-light travel is not instantaneous; "short" jumps routinely take up to two months, and "long" jumps can last six months or more. The SFTE generated a resonance field, which when coupled with the unusual physics of the Slipstream, allowed for dramatically shorter transit times between stars; however, scientists noted an odd "flexibility" to temporal flow while inside the Slipstream. Though no human scientist is sure why travel time between stars is not constant, many theorize that there are "eddies" or "currents" within the Slipstream. There is generally a five to ten percent variance in travel times between stars. This temporal inconsistency has given military tacticians and strategists fits-hampering many coordinated attacks.
  • 2130 - The Earth government unveils the first in a line of colony ships; given conditions on Earth are deteriorating in the face of overpopulation, hitching a ride out to a colony becomes a highly attractive option. Additionally, the Earth government plans to attach military personnel to each colony, to help better utilize the massive (and expensive) standing fleets. Because FTL travel is still fairly new and expensive, colonists and military personnel face a stringent regimen of physical and mental testing. In theory, only the best-qualified citizens and soldiers are allowed to colonize "nearby" worlds. This is the birth of the Inner Colonies; typically, the Inner Colonials are considered the most elite, best, and brightest.
  • 2313 - The construction of the Quito Space Tether is completed.
  • 2317 - Tobias Fleming Shaw, the co-creator of the Shaw-Fujikawa Slipspace Drive, dies at age ninety-seven.
  • 2318 - Wallace Fujikawa (the co-creator of the Shaw-Fujikawa Slipspace Drive) dies at the age of one hundred-two.
  • 2321 - The ORION Project is first initiated. Poor results determine the Office of Naval Intelligence to temporarily put the project on hold. The Project is re-initiated in 2491.
  • 2332 - The Ross-Ziegler Blip is discovered by two Earth geologists.
  • 2362 - The Odyssey is launched. The lead ship in the colony vessels, the Odyssey-laden with troops and terraforming gear-spearheads the colonization of a new world. This sparks the first wave of Human expansion beyond the confines of the Sol System.
  • 2390 - The Quito Space Tether, completed in 2313, is officially named.


  • 2462 - The Unggoy Rebellion occurs. After much conflict in the Covenant, an Arbiter is sent in to end the rebellion. Its conclusion marks the beginning of the 23rd Age of Doubt and the ascension of the High Prophets of Tolerance and Restraint and the High Prophetess of Obligation.
  • 2469 - The UNSC Skidbladnir lands on Harvest in the Epsilon Indi System. The ship is eventually used for materials to build the colony, its power plant is used to power the capital city of Utgard.
  • 2473 - Phoenix-class Colony Ship, UNSC Spirit of Fire is constructed.
  • 2488 - Harvest had the highest agricultural productivity rate per capita of any UNSC colony Harvest is the most productive planet in the UNSC, producing fruits and other crops.
  • 2489 - While aboard CMA Season of Plenty Crewman Apprentice Preston Cole formulates a new way of calculating slipspace input parameters, attracting the attention of his superior officers.
  • 2490 - Human space encompasses more than 800 worlds throughout the Orion Arm of the Milky Way Galaxy (ranging from fairly well-tamed planetary strongholds to tiny hinterland settlements). Outward expansion continued, and the Inner Colonies become a political and economic stronghold, though they rely heavily on raw materials supplied by the Outer Colonies. During this period, the planet Reach (orbiting Epsilon Eridani, right on Earth's metaphorical doorstep) becomes the UNSC's primary Naval yard and training academy. Reach is a major producer of warships and colony vessels, as well as a training ground for covert operatives and Special Forces.
  • 2491 - The Orion Project is initiated, the Spartan-I Program operating under its auspices.The planet Onyx is discovered and first investigated in this year.Rear Admiral Ned Rich is born.Elias Carver publishes a set of theories known as the Carver Findings. A report is made on Onyx, the planet being recommended for colonization.
  • 2492 - The Covenant stumbles upon Doisac, the Jiralhanae homeworld. The Jiralhanae were just beginning to recover after warring themselves back into a pre-industrial state, and were quickly forced into submission by the Covenant's superior forces, making them the final species absorbed into the alliance.
  • 2494 - Three UNSC destroyers confront the insurgent-controlled UNSC Callisto in the 26 Draconis System at the culmination of the Callisto Incident. It is effectively the beginning of the Insurrection.
  • 2495 - The UNSC takes control of the station Hopeful and adds fusion reactors and a Shaw-Fujikawa Slipspace Drive, turning the Hopeful into the largest mobile battlefield hospital in history. It is commanded by the legendary Admiral Ysionris Jeromi.
  • 2496 - The Eridanus Insurrection is defeated by UNSC forces at the cost of four destroyers. Still, this is considered a monumental victory for the rebels, as most of their forces were still active.
  • 2497 - The Colonial Military Administration's involvement with the Eridanus Rebels goes public, and its power begins to shift toward UNSC control.
  • 2498 - The UNSC colony of Arcadia opens the DSRA, (the Deep Space Research Array), designed to research and study extremely high gravity events, such as black holes, and other areas that exploratory vessels cannot visit directly. The DSRA is eventually destroyed by the Covenant during the initial attack on Arcadia in 2531
  • 2500 - Captain James Cutter was sent to the UNSC School of the North Star, on Earth, to study astro-navigation and political science.
  • 2501 - Skirmish at Theta Ursae Majoris - The UNSC Gorgon and the Insurrectionist Bellicose fight to a draw in the Theta Ursae Majoris System.
  • 2503 - Admiral Harold Stanforth informs Preston Cole that his second wife, Lyrenne Castilla is a high ranking Insurrectionist leader. Cole is given three hours to bring her in, but finds that she has already fled.
  • 2504 - A battle takes place in the Theta Ursae Majoris System between the UNSC and the Insurrectionists.
  • 2506 - Project ORION, the original SPARTAN project - the first attempt by the Colonial Military Administration to create and train teams of super-soldiers for covert military operations in the Outer Colonies - is deactivated. Though the Spartans are effective, their abilities fall short of original expectations, and they are far too expensive to develop and field. The soldiers in the program are reassigned to various special operations units.
  • 2509 - the UNSC Pillar of Autumn is constructed over Mars, beginning its 43 years of service in the UNSC. Also Elias Carver would commit suicide sometime this year.
  • 2510 - A report is made on Forerunner artifacts are found during routine excavations in an area designated Zone 67.
  • 2511 - A geological survey team on Sigma Octanus IV finds rocks with odd compositions. They later found out these rocks were introduced from meteor impacts roughly 60,000 years earlier.
  • 2524 - Covenant-Human War Begins
  • 2552 - Battle of Reach, Battle for Earth begins
  • 2553 - Humanitys war for survival comes to an end
  • 2610 - Three years after its conception, the completely hand-crafted John-117 Monument was finished and placed in the Museum of Humanity to commemorate the Spartans timeless and selfless dedication to protect humanity.

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