Halo Universe Timeline

	A	B	C	D	E
1	A chronological timeline of the Halo universe.
2	Legend	Birth		http://www.reddit.com/r/halo
3		Death		http://www.reddit.com/r/HaloStory
4		Glassing		http://www.reddit.com/u/afterbang
5		Alternate Reality		http://www.reddit.com/u/Defguru
6		Real World Event		Halo Media Timeline by CIA391
7		Discontinuity
8
9	Date	Event	Halopedia Page	Source	Notes
10	100,000,000,000 BCE	The Precursors are said to begin to accumulate knowledge in the Domain.		Halo: Renegades, page 161	"...said to contain a hundred billion years' worth of information..."
11	~2,000,000,000 BCE	The Precursors arrive in Path Tolgreth.		Halo: Warfleet page 8	"The beings known as Precursors arrived in the Milky Way galaxy as creators and caretakers billions of years ago."
12	500,000,000 BCE	The Precursors accumulate their total knowledge in a vast reserve of rules and a library of experiences.		Halo: Silentium page 208	"During our debate, the Gravemind hinted at a vast reserve of rules accumulated more than half a billion years ago, a huge library of experiences and disputes codified into the total wisdom of the Precursors."
13	99,997,500 BCE	A date the civilization on Netherop may have died out.		Halo: Oblivion page 377	"John was looking at a vast, primordial city built by a society that had perished a hundred--or a thousand--or possibly a million--centuries before."
14	Before ~15,000,004 BCE	The Weapon attributes data from Totem Rings on Installation 07 as being older than the Forerunners.	https://www.halopedia.org/Ring_artifact	Halo Infinite, The Weapon dialogue
15	Before ~15,000,004 BCE	Guardians are used by Precursors as tenders and recorders of their legacy.	https://www.halopedia.org/Guardian_Custode	Halo Encyclopedia (2022), pg. 387
16	Before ~15,000,004 BCE	The Eld is created.	https://www.halopedia.org/Mantle#Symbol	Halo Encyclopedia (2022), pg. 317
17	~15,000,004 BCE	The Precursors seed the Forerunners on Ghibalb, branching them from the same base stock as humanity.		https://www.halowaypoint.com/en-us/universe/species/forerunners, Halo Encyclopedia (2022), pg. 310
18	After ~15,000,004 BCE	The Forerunners develop hard light during the early rise of their interstellar civilization.	https://www.halopedia.org/Hard_light	Halo Encyclopedia (2022), pg. 325
19	After ~15,000,004 BCE to ~1,097,004 BCE	The Theoretical rate is one of the few with an unbroken chain of records dating back to the interstellar period on Ghibalb.	https://www.halopedia.org/Rate#Theoreticals	Halo Encyclopedia (2022), pg. 321
20	~10,097,004 BCE	Forerunners first explore Path Kethona.	http://www.halopedia.org/Path_Kethona	Halo: Silentium page 58
21	~10,097,004 BCE	The war between the Forerunners and Precursors takes place.	http://www.halopedia.org/Forerunner-Precursor_war	Halo: Silentium page 181
22	~10,097,004 BCE	Two Precursors escape the genocide in Path Kethona. Some Forerunners hide them, but they die and become flowers containing their genetic code.		Halo: Point of Light page 315
23	After ~10,097,004 BCE	Some Precursors flee to Neska and establish the Sanctum Overmound. Over time, they come to be called the Veiled Ones, then the Lost Ones, then Nothing.	https://www.halopedia.org/Precursor	Halo: Outcasts pages 253-254
24	After ~10,097,004 BCE	A Guardian Custode is sent to Neska. Nothing speaks to Chynndokhali and tells the people to gather at the temple. The Guardian is destroyed by the Divine Hand. Eventually, its pieces are collected in the Reliquary of the Sanctum Overmound. The firing of the weapon severely damages Neska.		Halo: Outcasts Adjunct
25	~10,097,004 BCE to 122,990 BCE	The Forerunners expand their influence in Path Tolgreth.	https://www.halopedia.org/Forerunner	Halo Encyclopedia (2022), pg. 8
26	~9,097,004 BCE	The two Precursors on Sedaaro in Path Kethona germinate.		Halo: Point of Light page 315	"'...seeds that germinated for a million years.'"
27	~9,097,004 BCE	The Primordial arrives in the galaxy.		Halo: Silentium page 173	"The one the Didact questioned on Charum Hakkor arrived on the margins of our galaxy nine million years before."
28	~2,000,000 BCE	A stellar engineering accident causes the destruction of the Forerunner homeworld of Ghibalb, as well as several planets across twelve systems in the Orion Complex.	https://www.halopedia.org/Ghibalb	Halo: Point of Light page 273	"'Several million years ago...'"
29	After ~2,000,000 BCE	The destruction of Ghibalb triggers a Forerunner diaspora that eventually recoalesces into the ecumene.	https://www.halopedia.org/Ghibalb	Halo Encyclopedia (2022), pg. 341
30	~1,097,004 BCE	Boundless passes away.	http://www.halopedia.org/Boundless_(Forerunner)	Halo: Silentium page 67
31	~1,097,004 BCE	The Theoretical rate is forcibly merged with the Builder rate.		Halo: Silentium page 67	"Soon after her death, her rate had been forcibly merged with the Builders.
32	~1,000,000 BCE	The two Precursors in Path Kethona bloom.		Halo: Point of Light page 315	"'Only in the last million years have they bloomed.'" in 2558.
33	~597,449 BCE	A Forerunner civil war takes place.		Halo: Silentium page 104	"During one of our interminable civil wars, half a million years before my birth..."
34	147,449 BCE	Forerunners rise as the prominent species in the galaxy by advancing technological discoveries gathered from the remnants left by the Precursors.		Halo Encyclopedia
35	~147,449 BCE	The Ancestors begin to spread their civilization outward along the galactic arm.		Halo: Cryptum page 20
36	122,990 BCE	The Forerunners establish their ecumene by this date, and establish Maethrillian, the Capital.	https://www.halopedia.org/Forerunner	Halo Encyclopedia (2022), pg. 8
37	Early in the Forerunner ecumene	The binary rifle is developed.	https://www.halopedia.org/Z-750_binary_rifle	Halo Encyclopedia (2022), pg. 393
38	Before 116,329 BCE	Harmony in Gifted Symmetry is born.		Halo: Point of Light page 131	"'Harmony had just entered her four thousandth year when I was born.'"
39	112,329 BCE	First-Light-Weaves-Living-Song, later the Librarian, is born.	https://www.halopedia.org/Librarian	Halo Encyclopedia (2022), pg. 365
40	111,209 BCE	Spendid-Dust-of-Ancient-Suns, later 000 Tragic Solitude, is born.	https://www.halopedia.org/Splendid-Dust-of-Ancient-Suns	Halo Encyclopedia (2022), pg. 368
41	110,862 BCE	Faber-of-Will-and-Might, later the Master Builder, is born.	https://www.halopedia.org/Faber	Halo Encyclopedia (2022), pg. 366
42	110,255 BCE	Shadow-of-Sundered-Star, later the Ur-Didact, is born.	https://www.halopedia.org/Ur-Didact	Halo Encyclopedia (2022), pg. 364
43	108,992 BCE	Chant-to-Green is born.	https://www.halopedia.org/Chant-to-Green	Halo Encyclopedia (2022), pg. 368
44	107,564 BCE	The Ancestors discover the Primordial.	https://www.halopedia.org/Primordial	Halo Encyclopedia (2022), pg. 8
45	Decades before 107,419 BCE	The Librarian rises to prominence in Forerunner leadership.	https://www.halopedia.org/Librarian	Halo Encyclopedia (2022), pg. 365
46	Before 107,445 BCE	The Didact and Bitterness-of-the-Vanquished discuss the upcoming war against the Ancestors. The Didact becomes interested in the under-development cindershot, and Bitterness says a variant, the backdraft cindershot, is already ready for him.	https://www.halopedia.org/Backdraft_Cindershot	Canon Fodder 141, Didact's Delights, https://www.halowaypoint.com/news/canon-fodder-didact-delights
47	107,445 BCE	The war between Forerunners and the Ancestors begins.	https://www.halopedia.org/Human-Forerunner_wars	Halo: Cryptum, pg. 131
48	During the Human-Forerunner War	Vast numbers of war sphinxes are employed in the Forerunners' war with the Ancestors.	https://www.halopedia.org/War_sphinx	Halo Encyclopedia (2022), pg. 388
49	During the Human-Forerunner War	The light rifle is a staple of the Forerunner military arsenal during raids against Ancestor warships and redoubts.	https://www.halopedia.org/Z-250_lightrifle	Halo Encyclopedia (2022), pg. 390
50	107,525 BCE	The Siege of Charum Hakkor begins.	https://www.halopedia.org/Battle_of_Charum_Hakkor	Halo Encyclopedia (2022), pg. 8
51	107,525 BCE to 107,472 BCE	The Didact's warriors favor the burst-fire variant of the light rifle during the Siege of Charum Hakkor.	https://www.halopedia.org/Z-250_lightrifle	Halo Encyclopedia (2022), pg. 390
52	107,472 BCE	The Forerunners emerge victorious at the Siege of Charum Hakkor. The Ancestors are devolved and exiled to Erde-Tyrene.	https://www.halopedia.org/Battle_of_Charum_Hakkor	Halo Encyclopedia (2022), pg. 8	"After three long years..."
53	~107,449 BCE	The Didact speaks to the Primordial.		Halo: Cryptum page 342
54	After 107,449 BCE	859 Static Carillon is created.	https://www.halopedia.org/859_Static_Carillon	Halo Encyclopedia (2022), pg. 370
55	~106,449 BCE	The Librarian is given the title of Lifeshaper.		Halo: Silentium page 31	"That title came to me just before I walked among the defeated humans at Charum Hakkor."
56	~106,449 BCE	The Librarian establishes a research station on Erde-Tyrene.		Halo: Cryptum page 17
57	~103,449 BCE	Maker-of-Cherished-Mountains is born.		Halo: Cryptum page 225
58	~103,449 BCE	Wise-Hands-to-Forge is born.		Halo: Cryptum page 225
59	101,295 BCE	Growth-Through-Trial-of-Change is born.	https://www.halopedia.org/Growth-Through-Trial-of-Change	Halo Encyclopedia (2022), pg. 369
60	~99,449 BCE	Maker-of-Moons is born.	https://www.halopedia.org/Maker-of-Moons	Halo: Silentium page 91	"Maker was less than two thousand years old."
61	98,764 BCE to 97,764 BCE	Skirr-class dreadnoughts are built, and serve in pioneer and pacification fleets.	https://www.halopedia.org/Skirr-class_battlecruiser	Halo Encyclopedia (2022), pg. 382
62	~98,549 BCE	The Confirmer begins his watch over the Qom Yaekesh System.		Halo: Cryptum page 171
63	~98,549 BCE	The Librarian discovers a hard copy of Boundless' studies preserved on Keth Sidon.		Halo: Silentium page 67	"A century before the Didact entered his Cryptum..."
64	~98,449 BCE	The Didact is found in comtempt of the Council and ordered to halt the construction of his shield worlds.		Halo: Silentium page 47
65	~98,449 BCE	The Didact enters a Cryptum and is hidden on Erde-Tyrene.		Halo: Cryptum page 81
66	~98,449 BCE	The senescent Array is created.		Halo: Primordium page 217
67	98,445-97,445 BCE	The particle cannon on Installation 00 is constructed.		Halo Wars 2 "Phoenix Logs" - Particle Cannon
68	~98,420 BCE	The construction of the Audacity is started.	http://www.halopedia.org/Audacity	Halo: Silentium page 60	The construction took ten years. Permission from the Old Council to make the journey took another ten.
69	~98,409 BCE	The construction of the Audacity is completed.		Halo: Silentium page 60	The construction took ten years. Permission from the Old Council to make the journey took another ten.
70	98,401 BCE	Keeper-of-Stone-Songs is born.	https://www.halopedia.org/Keeper-of-Stone-Songs	Halo Encyclopedia (2022), pg. 369
71	Long before ~98,399 BCE	The Miners locate former Precursor worlds and secretly move them to a specialized world engine at the periphery of the Ecumene for deconstruction and analysis. What they learned remains unknown.	https://www.halopedia.org/Miner	Halo Encyclopedia (2022), pg. 319
72	~98,399 BCE	The Ecumene Council grants the Librarian permission to make a journey to Path Kethona.		Halo: Silentium page 60	The construction took ten years. Permission from the Old Council to make the journey took another ten.
73	~98,399 BCE	The Librarian visits Path Kethona.	http://www.halopedia.org/Path_Kethona	Halo: Silentium page 163	"After she put you in a Cryptum, and stored the Cryptum on Erde-Tyrene, she commissioned a special ship, assembled a crew, and made a visit to Path Kethona. This was about nine hundred and fifty years ago."
74	~98,399 BCE	The Librarian discovers a biological Domaint on Sedaaro in Path Kethona.		Halo: Silentium page 158
75	~98,399 BCE	The Librarian discovers the genetic code of two Precursors who had escaped the genocide. She takes these with the plan to save the Precursor race.		Halo: Point of Light chapter 44
76	~98,166 BCE	Soma, later Soma the Painter, is born.	https://www.halopedia.org/Soma	Halo: Evolutions "Soma the Painter"
77	98,119 BCE	Glory-of-a-Far-Dawn is born.	https://www.halopedia.org/Glory-of-a-Far-Dawn	Halo Encyclopedia (2022), pg. 369
78	~97,964 BCE	Builder Security eclipses the Warrior-Servant rate in stature and authority.	https://www.halopedia.org/Builder_Security	Halo Encyclopedia (2022), pg. 318	"...during the centuries before the appearance of the Flood..."
79	~97,764 BCE	Soma the Painter sends a message to the Auditor and Prelate regarding the first landing of the Flood.		Halo: Evolutions "Soma the Painter"
80	~97,764 BCE	First contact occurs between the Forerunner Primary Pioneer group and the Flood on G617 g1.	http://www.halopedia.org/Primary_Pioneer_Group	Halo 3 Terminals (2)
81	Decades before 97,764 BCE	Raptors are created by the machinations of the Master Builder, and are made for Builder Security.		Halo Encyclopedia (2022), pg. 383
82	97,764 BCE	The Forerunner-Flood War begins.	https://www.halopedia.org/Forerunner-Flood_war	Halo Encyclopedia (2022), pg. 9
83	~97,764 BCE	The Sojourner-class dreadnought is deployed.	https://www.halopedia.org/Sojourner-class_dreadnought	Halo Encyclopedia (2022), pg. 382
84	Early in the Forerunner-Flood War	Despite the Forerunners' elaborate management of the Ecumene's overwatch network, authorities never fully mitigate the corrosive effects of abusing slipspace at the scale demanded by the Forerunners. This restricts their military operations in the early years of the Forerunner-Flood War.	https://www.halopedia.org/Slipstream_space#Reconciliation	Halo Encyclopedia (2022), pg. 339
85	Early in the Forerunner-Flood War	The suppressor resurfaces during the Forerunner-Flood War.	https://www.halopedia.org/Z-130_Suppressor	Halo Encyclopedia (2022), pg. 391
86	After 97,764 BCE	The Master Builder gives Mendicant Bias full control of the Forerunners' defenses, including the senescent Halo Array.		Halo Encyclopedia (2022), pg. 313
87	After 97,764 BCE	All Foreruners make a rapid transition to a defensive posture, beginning with the widespread adoption of combat skins.	https://www.halopedia.org/Combat_skin	Halo Encyclopedia (2022), pg. 324
88	After 97,764 BCE	Armiger units' autonomy is reduced after the logic plague subverts larger armiger forces.	https://www.halopedia.org/Armiger	Halo Encyclopedia (2022), pg. 330
89	97,764 BCE to 97,445 BCE	The Juridical communication network is compromised by the Flood and cordoned off to mitigate the spread of the logic plague. This effectively shuts down the Forerunners' legal system.	https://www.halopedia.org/Juridical	Halo Encyclopedia (2022), pg. 321
90	97,764 BCE to 97,445 BCE	The Forerunners utilize the Sharquoi as weapons.	https://www.halopedia.org/Sharquoi	Halo Encyclopedia (2022), pg. 215
91	97,764 BCE to 97,445 BCE	Massive numbers of Aggressor Sentinels are deployed during the Forerunner-Flood War.	https://www.halopedia.org/Aggressor_Sentinel	Halo Encyclopedia (2022), pg. 327
92	97,764 BCE to 97,445 BCE	Many Assembler Sentinels are used in an offensive role during the Forerunner-Flood War.	https://www.halopedia.org/Assembler_Sentinel	Halo Encyclopedia (2022), pg. 328
93	97,764 BCE to 97,445 BCE	Most armiger units are expended in the Forerunner-Flood War.	https://www.halopedia.org/Armiger	Halo Encyclopedia (2022), pg. 330
94	97,764 BCE to 97,445 BCE	The Flood destroy most Forerunner buildings.		Halo Encyclopedia (2022), pg. 334
95	97,764 BCE to 97,445 BCE	Forerunner ships abandon dynamism for conformism as the use of ancillas becomes restricted.	https://www.halopedia.org/Ancilla	Halo Encyclopedia (2022), pg. 338
96	97,764 BCE to 97,445 BCE	Translocation grid systems are heavily restricted or completely disabled during the Forerunner-Flood War to prevent the Flood from using them.	https://www.halopedia.org/Teleportation_grid	Halo Encyclopedia (2022), pg. 339
97	97,764 BCE to 97,445 BCE	On Shield World 0459, three Prometheans fight the Flood to save the damaged monitor, 295 Harken Watch. They seal off the Shield World's interior.	https://www.halopedia.org/Trove	Halo Encyclopedia (2022), pg. 358
98	97,764 BCE to 97,445 BCE	Controls of Forerunner ships are consolidated, taking the form of dedicated high-bandwidth information vector consoles that require physical contact and biological integrity checks to activate.		Halo Encyclopedia (2022), pg. 376
99	97,764 BCE to 97,445 BCE	The Forerunners create countermeasures to attacks launched by their own ships, now in Flood control. However, each countermeasure is in turn used against them as the Flood turn more vessels.		Halo Encyclopedia (2022), pg. 376
100	97,764 BCE to 97,445 BCE	As the Forerunner-Flood War goes on, Forerunner warships are made more deadly, used to destroy planets and stars.		Halo Encyclopedia (2022), pg. 381