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This page has been used to collect chronology data from across the wiki for MWM's review.

Helpful Links[edit]

  1. Category:Chronology
  2. Category:Milieus
  3. Category:Timeline
  4. Date Conversion
  5. Empty Quarter Timeline
  6. Forum:Articles in time and place
  7. Forum:Post-Classic Era information
  8. Forum:Proposal for Policy for article time
  9. History
  10. Imperium Eternal
  11. Milieu
  12. Retcon AKA Retroactive Continuity
  13. Setting
  14. Template:StellarData.layout/doc
  15. Third Imperium
  16. Timeline
  17. Traveller Integrated Timeline

Notes (2019)[edit]

Tjoneslo, I want to make this happen soon.

  • Do you feel it needs to be further discussed or vetted before we do it?
- Maksim-Smelchak (talk) 13:43, 30 January 2019 (EST)

The Lorenverse years span from 1115 to sometime in the 1400s. Otherwise I'm fine with this. Tjoneslo (talk) 20:48, 30 January 2019 (EST)

Ok. Thanks.

- Maksim-Smelchak (talk) 10:13, 31 January 2019 (EST)

Tjoneslo, please look at Master Categories Research (2019).

  • Any comments or feedback?
- Maksim-Smelchak (talk) 14:19, 1 February 2019 (EST)

Notes (2016)[edit]

Tjoneslo, where did the date categories on the base pages to this article come from?
- Maksim-Smelchak (talk) 08:22, 18 September 2016 (EDT)

I used the various historical eras and dates of Humaniti in Charted Space, based upon the various bits of canon. Mostly this was supposed to be used to give broad categories to the various articles, vs the more narrow designed to give more background to a campaign. First, second and third Imperiums, as well as the interstellar Wars and Long Night are all well established as eras. I made up the "Long Silence" and "Rise of the Vilani" for name. If you do a search through the Forums I think you can find the discussions around these names. Tjoneslo (talk) 15:17, 18 September 2016 (EDT)

It's all very good and clever, but I think we should re-standardize on what is in agent of the Imperium.
The Third Imperium article has those mapped out if I recall correctly.
- Maksim-Smelchak (talk) 00:37, 19 September 2016 (EDT)

Are you referring to this table or this table] ? Tjoneslo (talk) 18:06, 19 September 2016 (EDT)

No the overview table that I built in 2015. The historical eras table that Wayne built using Agent.
As far as I can tell, it is the same as the one in Don's timeline.
It's tough mapping out something that has not so much rhyme or structure. Don must have loved it.
- Maksim-Smelchak (talk) 19:39, 19 September 2016 (EDT)

If I'm reading this right we would have the following:
8. Years of the Interregnum (1116 - 1247)
9. Years of the Fourth Imperium (1248 - 1899)
10. Years of the Galaxiad (1900 - )
I fully support making this change. This looks great.
The other thing the division of the Years of the Third Imperium into the 10 sub-parts. I don't think we should split the Third Imperium Timeline into these sub-parts. They're too short for the Timeline, and fit better as Category:Milieus. I like the idea of borrowing some of the names for the existing era's. For example, Category: Era: Milieu 990 looks so much better as Category: Era: Solomani Crisis. Tjoneslo (talk) 21:17, 19 September 2016 (EDT)

At that point, I was just doing the best I could to map things out. It was original research so to speak.
I think we should open up discussion on this.
- Maksim-Smelchak (talk) 22:13, 19 September 2016 (EDT)

Master Categories Research (2019)[edit]

Term Definition[edit]

ERA: A long and distinct period of history with a particular feature or characteristic.

  • A system of chronology dating from a particular noteworthy event.
  • An era is a span of time defined for the purposes of chronology or historiography, as in the regnal eras in the history of a given monarchy, a calendar era used for a given calendar, or the geological eras defined for the history of Earth.
  • Period, epoch, era, age mean a division of time.
  • Synonyms: epoch · age · period · time · eon · span · generation · stage


  • A person's social environment.
  • Zeitgeist
  • 1. The people, physical, and social conditions and events that provide the environment in which someone acts or lives
  • 2. The people and the physical and social conditions and events that provide a background in which someone acts or lives
  • Synonyms: environment · background · backdrop · setting · context · atmosphere · scene · location · locale · conditions · surroundings · habitat · environs · sphere · world · territory · home · domain · preserve · province · circle · element


  • A major historical event that greatly influences future events and usually disrupts of eliminates the status quo altogether in paradigmatic change.
  • A major historical event as recorded by historians.


  • A minor historical event that lacks the significance of a major event.
  • Many minor events lead to a major event.
  • Historians often overlook them and they often remain unrecorded.

Geologic Time Scale (GTS)

  1. Age
  2. Epoch
  3. Period
  4. Era
  5. Eon
  6. Supereon

Three-age system (tripartite divisions of historic time periods)

  1. Early
  2. High
  3. Late

Three-age system (methodological concept)

  1. The Stone Age
  2. The Bronze Age
  3. The Iron Age

TL Chronological Periodization:

  1. Age = x1 TL
  2. Epoch = x3 TLs
  3. Period = x9 TLs
  4. Era = x28-30 TLs
  5. Eon = x31-33+ TLs

Techno-Chronological Concepts:

  • Accelerating Tech Level: Progress speeds up when technology advancing shortening the amount of time before the next advance
  • Singularity, Technological: A point of paradigmatic change, upsetting previous settings. The big one occurs at TL:31-33. Littles ones end each period of 9 TLs or accelerated Epoch-Periods of 3 TLs near the end.

Time Typologies:

  • Cyclical (Wheel of time)
  • Linear progressive (conventional time)
  • Nonlinear progressive (unconventional time)

Techno-Chrono Categories (Anthropology):

  • Age
  • Period
  • Tools
  • Economy
  • Dwelling sites
  • Society
  • Religion

The TEN Chronological Eras[edit]

1. Years of the Long Silence (-300,000 to -9234)

Years of the Long Silence (-300000 to -9234) Imperial Sunburst-Sun-IISS-Traveller.gif

2. Rise of the Vilani (-9235 to -4044)

Rise of the Vilani (-9235 to -4044) FlamingEyeIcon128.png
-10000s, -9900s, -9800s, -9700s, -9600s, -9500s, -9400s, -9300s, -9200s, -9100s,
-9000s, -8900s, -8800s, -8700s, -8600s, -8500s, -8400s, -8300s, -8200s, -8100s,
-8000s, -7900s, -7800s, -7700s, -7600s, -7500s, -7400s, -7300s, -7200s, -7100s,
-7000s, -6900s, -6800s, -6700s, -6600s, -6500s, -6400s, -6300s, -6200s, -6100s,
-6000s, -5900s, -5800s, -5700s, -5600s, -5500s, -5400s, -5300s, -5200s, -5100s,
-5000s, -4900s, -4800s, -4700s, -4600s, -4500s, -4400s, -4300s, -4200s, -4100s

3. First Imperium (-4045 to -2421)

First Imperium (-4045 to -2421) FirstImperiumIcon128.png
-4000s, -3900s, -3800s, -3700s, -3600s, -3500s, -3400s, -3300s, -3200s, -3100s,
-3000s, -2900s, -2800s, -2700s, -2600s, -2500s

4. Interstellar Wars (-2422 to -2203)

Interstellar Wars (-2422 to -2203) TerranConfedIcon128.png
-2400s, -2300s

5. Second Imperium (-2204 to -1776)

Second Imperium (-2204 to -1776) RuleOfManIcon128.png
-2200s, -2100s, -2000s, -1900s, -1800s

6. Long Night (-1775 to 0)

Long Night (-1775 to 0) Imperial Sunburst-Sun-IISS-Traveller.gif
-1700s, -1600s, -1500s, -1400s, -1300s, -1200s, -1100s,
-1000s, -900s, -800s, -700s, -600s, -500s, -400s, -300s, -200s, -100s

7. Third Imperium (0 to 1116)

Third Imperium (0 to 1116) ThirdImperiumIcon128.png
0s, 100s, 200s, 300s, 400s, 500s, 600s, 700s, 800s, 900s, 1000s, 1100s.

8a. Rebellion, Collapse and Virus (1116 to 1220)

Rebellion, Collapse and Virus (1116-1220) RebellionIcon128.png
1100s, 1200s.

8b. Imperium Eternal (1115 to sometime in the 1400s), an alternate timeline.

Imperium Eternal AKA Lorenverse Imperial Sunburst-Sun-IISS-Traveller.gif

9. Fourth Imperium (1220+)

Fourth Imperium (1220+) FourthImperium128.png
1200s, 1300s, 1400s, 1500s, 1600s, 1700s, 1800s.

10. The Galaxiad (1900+)

The Galaxiad (1900+) Imperial Sunburst-Sun-IISS-Traveller.gif

Historical Eras[edit]

The history of the Third Imperium is generally separated by Sanctioned Imperial Chroniclers into a number of different periods:

The Progress of The Third Imperium
Eras of Imperial History Dates Imperium Remarks
Dawn of the Third Imperium 000 - 119 Third Imperium Iron Era
The Antebellum Years 120 - 474 Third Imperium Iron Era
Imperial Disarray 475 - 621 Third Imperium Silver Era
Imperial Recovery 622 - 767 Third Imperium Silver Era
The Stumbling Years 768 - 939 Third Imperium Silver Era
The Solomani Crisis 940 - 1002 Third Imperium Golden Era
The New Millennium 1003 - 1084 Third Imperium Golden Era
The Golden Age 1085 - 1106 Third Imperium Golden Era
Fifth Frontier War 1107 - 1110 Third Imperium Golden Era
An Uncertain Future 1111 - 1115 Third Imperium Golden Era
Rebellion, Collapse & Virus 1116 - 1220 Interregnum Bronze Era
  • Sometimes called Collapse & Interregnum.
Years of the Collapse 1221 - 1247 Interregnum Bronze Era
False Spring 1248 - 1899 Fourth Imperium Steel Era
Milieu Galaxiad 1900 - Far Future Interregnum Platinum Era

NOTE: From Agent of the Imperium novel.

Era List[edit]

Era Notes (2007)[edit]

This proposal should allow all of us to be happy regarding articles in time and space. Please read and comment, I really do want feedback on this.

  • All articles will have a "era" category to indicate when they were "written". The following are the "canon" ones, and others can be added as needed:
    • Era: Interstellar Wars => GURPS IW
    • Era: Milieu 0 => T4 era
    • Era: Milieu 990 => T20 era
    • Era: Milieu 1116 => Classic Era
    • Era: Rebellion => Late MT
    • Era: New Era => TNE
    • Era: Milieu 1250 => TNE & 1248
    • Era: Milieu 1120 => GT Timeline

AD Dates for Historical Periods[edit]

From the T4 Core Rule book, p 8:

  • Vilani Era: 4700 BC - 2300 AD
  • Terran Confederation: 2100 AD - 2300 AD
  • Rule of Man: 2300 AD - 2750 AD
  • Long Night: 2750 AD - 4550 AD
  • Third Imperium: 4521 AD - 5637 AD
  • Aslan Border Wars: 3400 AD - 4900 AD
  • Vargr Campaigns: 4700 AD - 4900 AD
  • Barracks Emperors: 5100 AD - 5140 AD
  • Solomani Expansion: 5121 AD - 6500 AD
  • Rebellion: 5367 AD (no end date given)

No entry for TNE/Recovery/4th Imperium.


The broad sweep of history is divided, roughly, into 10 eras. These eras are largely based upon the rise and fall of Humaniti and their empire of the stars. While other races, particularly the other Major Races, may have a differing division of eras, the Imperial Encyclopedia uses the Humaniti-centric one.

Each of the Era may be divided into one or more "milieus", each between one and two decades long, based upon events of interest to historians.

  1. Category: Years of the long silence (-300,000 to -9234)
  2. Category: Years of rise of the Vilani (-9235 to -4044)
  3. Category: Years of the First Imperium (-4045 to -2421)
  4. Category: Years of the Interstellar wars (-2422 to -2203)
  5. Category: Years of the Second Imperium (-2204 to -1776)
  6. Category: Years of the Long Night (-1775 to 0)
  7. Category: Years of the Third Imperium (0 to 1116)
  8. Category: Years of the Collapse (1117 to 1199)
  9. Category: Years of the Fourth Imperium (1200 to 1300)
  10. Category: Years of the Galaxiad (1900 +)

Alternate Timelines:

  1. Category: Years of the Imperium Eternal (1117 to ????)

GURPS Alternate Timeline — Strephon is not assassinated, the Rebellion did not occur, Virus was not released or even developed (though that is not known for certain), and the Fourth Imperium was not founded (obviously).

Traveller Game Eras & Editions (1977-2017)[edit]

Traveller Game Eras & Editions (1977-2017)
Setting Dates Era Name (Milieu) Primary Setting Events Associated Game/s Game Edition Pub. Date
(-2404 to -2203) Interstellar Wars First Imperium (Ziru Sirka) & Interstellar Wars GURPS Traveller: Interstellar Wars 06th Edition 2002
(-2204 to -1776) Rule of Man Collapse of First Imperium & Rule of Man (Second Imperium) GURPS Traveller: Interstellar Wars 06th Edition 2002
(-1775 to 0) Long Night Collapse of Second Imperium & Long Night T4: Marc Miller's Traveller 04th Edition 1996
(-25 to 75) Milieu 0 Third Imperium Founding & Sylean Federation T4: Marc Miller's Traveller 04th Edition 1996
(985 to 1002) Milieu 990 Third Imperium & Solomani Rim War Traveller D20 07th Edition 1977
(1100 to 1117) Milieu 1116 Third Imperium Base (Original) Setting & Fifth Frontier War Classic Traveller & Traveller5 (T5) 01st Edition 1977
(1116 to 1130) Milieu 1120 GURPS Traveller: Alternate Setting (Timeline with no Rebellion) GURPS Traveller 05th edition 1998
(1117 to 1130) Rebellion AKA Hard Times Collapse of Third Imperium (Rebellion) & Regency MegaTraveller 02nd Edition 1986
(1190 to 1220) New Era Reformation Coalition & Virus/New Era Traveller: The New Era 03rd Edition 1992
(1221 to 1300) Fourth Imperium Fourth Imperium Traveller: The New Era 03rd Edition 1992
(1221 to 1300) Milieu 1248 Fourth Imperium Traveller: The New Era 08th Edition 2006
(1301 to 1500) Collapse Collapse and Interregnum Traveller5 12th edition 2015+ (Future)
(1780 to 1840) False Spring The False Spring Traveller5 12th edition 2015+ (Future)
(1900+) Galaxiad The Galaxiad Traveller5 12th edition 2015+ (Future)

Imperial Overview[edit]

The Imperium is a series of consecutive galactic empires reaching back into recorded interstellar history.

Traveller Third Imperium Overview
# Imperium Years Mileu/s Timeline Literature Body Publisher/s Remarks
1a. Pre-First Imperium (-9235 to -4046) Rise of the Vilani Standard OTU Various Various Rise of the Vilani
  • Early rise, growth and expansion of Vilani civilization before the founding of the Ziru Sirka.
1b. First Imperium (-4045 to -2205) Ziru Sirka Standard OTU GURPS Traveller: Interstellar Wars Steve Jackson Games Ziru Sirka
1c. Sub-First Imperium (-2422 to -2205) Interstellar Wars Standard OTU GURPS Traveller: Interstellar Wars Steve Jackson Games Interstellar Wars
2a. Second Imperium (-2204 to -1776) Rule of Man Standard OTU Classic Traveller GDW Rule of Man
2b. Post-Second Imperium (-1775 to 0) Long Night Standard OTU Classic Traveller GDW Long Night
  • The interregnum between the Second and Third Imperiums.
  • Widespread collapse of interstellar civilization.
3a. Third Imperium (0 to 1116) Third Imperium Standard OTU Classic Traveller


GDW Third Imperium
3b. Sub-Third Imperium (0 to 199) Milieu 0 Standard OTU Marc Miller's Traveller Imperium Games "Iron Era of the Third Imperium" (0 to 499)
  • Milieu 0
  • The founding of the Third Imperium from the foundational state of the Sylean Federation forward.
  • An age of conquerors and founders...
  • Creation of the Domain system.
3c. Sub-Third Imperium (200 to 499) Milieu 200 Standard OTU Traveller (5th Edition) Far Future Enterprises "Iron Era of the Third Imperium" (0 to 499)
  • Milieu 200
  • The early years of the fledgling Third Imperium.
  • A meteoric rise and expansion of territory...
3d. Sub-Third Imperium (500 to 999) Milieu 500 Standard OTU Traveller (5th Edition) Far Future Enterprises "Silver Era of the Third Imperium" (500's to 999)
  • Milieu 500
  • Internal conflicts and the first civil war...
3e. Sub-Third Imperium (990 to 1100) Mileu 990 Standard OTU Traveller20 QuikLink Interactive "Golden Era of the Third Imperium" (Year 1,000+)
3f. Sub-Third Imperium (1100 to 1116) Mileu 1100 Standard OTU 1. Classic Traveller
2. Traveller20
3. Mongoose Traveller
Various "Golden Era of the Third Imperium"
  • Mileu 1100 (Default Setting)
  • A well-established Third Imperium reaching governance limits...
  • A mature empire looking to the future...
3g. Post-Third Imperium (1116 to 1220) Rebellion, Collapse & Virus Standard OTU 1. MegaTraveller
2. Traveller: The New Era
GDW Rebellion
  • The Golden Era of the third Imperium was cut short...
  • This period chronicles the collapse of the Third Imperium in great detail.
  • Sometimes called Collapse & Interregnum.
3h. Post-Third Imperium (1116 to 1220)
(1116 to 1130)
Years of the Imperium Eternal Alternate ATU GURPS Traveller Steve Jackson Games Years of the Imperium Eternal
  • An alternate timeline where the Third Imperium did not collapse.
4a. Pre-Fourth Imperium (1221 to 1247) Years of the Collapse Standard OTU Traveller: The New Era GDW Years of the Collapse
4b. Fourth Imperium (1248 to 1899) Milieu 1248 Standard OTU Traveller:The New Era: 1248 Avenger Enterprises Fourth Imperium
5a. Galaxiad (1900 to the Far Future) Milieu Galaxiad Standard OTU Traveller (5th Edition)

(in development)

Far Future Enterprises Galaxiad
  • An exciting new storyline set in the universe of Traveller!

Generalized Chronological Periodization (2019)[edit]

Ancient Times[edit]

  • Milieu (Setting):
    • Not a published setting. Only used for background.


  • Milieu (Setting):
    • Not a published setting. Only used for background.

First Imperium (Ziru Sirka)[edit]

Second Imperium (Rule of Man)[edit]

Third Imperium (Imperial Base Setting / Default)[edit]

Post-Third Imperium (Fourth Imperium)[edit]

Galaxiad (1900+)[edit]

  • TBD - Dates
  • 1.0 1.1 1.2 1.3 1.4 1.5 GURPS Traveller: Interstellar Wars