D’ERA IH’KHNOR T’RIHAN

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Romulan Year 0 / Terran Year 369 — The Romulan Diaspora
Proto-Romulans reject Surak’s teachings and depart Vulcan under the leadership of Tellus, beginning a long exile that reshapes their identity and values.

RY 105 / TY 474 — The Debrune Schism
Admiral Debrune leads dissident groups to Yadalla Prime and other worlds, marking early ideological and political fragmentation among Romulan-descended peoples.

RY 188 / TY 557 — Founding of Romulus
Romulus is settled as a permanent home world, transforming a migratory people into a planetary civilization.

RY 213 / TY 582 — Death of Tellus; Clan Wars Begin
With Tellus gone, competing clans and philosophies erupt into open conflict, shaping Romulan suspicion of internal dissent.

RY 295 / TY 664 — Unification under Jo’rek; D’era Codified
Romulus is unified under Jo’rek. D’era is formally articulated as duty to state and people, becoming the Empire’s philosophical core.

RY 304 / TY 673 — Conquest of Romii
Romulan power extends beyond the home system, testing early imperial reach.

RY 305 / TY 674 — The Age of Expansion Begins
Systematic territorial growth begins, driven by military, strategic, and ideological ambition.

RY 566 / TY 935 — Romulan Civil War
Internal power struggles erupt, underscoring the constant tension between unity and ambition.

RY 569 / TY 938 — Romulan Star Empire Organized; Senate Founded
The modern Star Empire takes form. The Senate becomes the central governing institution.

RY 901 / TY 1270 — Romulan–Vulcan Wars Begin
Centuries of hostility with Vulcan crystallize into open warfare, cementing secrecy and distrust as state doctrine.

RY 1001 / TY 1370 — Romulan–Vulcan Wars End
The conflict concludes without reconciliation, leaving a legacy of silence and strategic distance.

RY 1042 / TY 1411 — Magnetic Bottle Drive Invented
Romulan propulsion technology advances, laying groundwork for later cloaking and power systems.

RY 1327 / TY 1696 — Valkis XIV Overthrown; Praetorship Established
The Praetor becomes the executive authority of the Empire, reshaping Romulan governance.

RY 1672 / TY 2041 — First Romulan–Klingon War Begins
A major external war tests Romulan military doctrine.

RY 1700 / TY 2069 — First Romulan–Klingon War Ends
Conflict ends without lasting alliance, reinforcing Romulan strategic caution.

RY 1787 / TY 2156 — Romulan–Earth War
Romulans clash with humanity in a largely unseen but decisive conflict.

RY 1791 / TY 2160 — Battle of Cheron; Neutral Zone Established
The Romulan Neutral Zone is created, freezing relations with the Federation for a century.

RY 1897 / TY 2266 — First Federation Re-Encounter
The Neutral Zone is violated; Romulans reappear after a century of silence.

RY 1898 / TY 2267 — Klingon Alliance Formed
Romulans gain Klingon warp technology, reshaping their fleet capabilities.

RY 1899 / TY 2268 — The Enterprise Incident; First Breen Contact
Romulan intelligence operations expand beyond traditional rivals.

RY 1902 / TY 2271 — Battle of Dumok’azen
A significant military engagement reinforcing Romulan resolve.

RY 1923 / TY 2292 — Klingon Alliance Collapses
Strategic partnership ends, returning Romulus to isolationist tendencies.

RY 1924 / TY 2293 — Khitomer Conference
Major interstellar diplomatic effort involving Romulans, Klingons, and the Federation.

RY 1942 / TY 2311 — Tomed Incident; Treaty of Algeron
A catastrophic event leads to the cloaking treaty and deepens Romulan secrecy.

RY 1964 / TY 2313 — The Taurhai Attack
An internal or covert assault highlighting instability beneath the Empire’s surface.

RY 1975 / TY 2344 — Attack on Narendra III
Romulan aggression destabilizes Federation–Klingon relations.

RY 1977 / TY 2346 — Attack on Khitomer Outpost
Further entrenchment of Romulan reputation for calculated escalation.

• RY 1994 / TY 2364 — End of Romulan Isolation
  Romulans re-enter galactic diplomacy during the TNG era.

RY 1995 / TY 2343 — Battle of Chi’tan
A significant but lesser-known military confrontation.

RY 1997 / TY 2366 — Defection of Admiral Alidar Jarok
A rare and destabilizing act of conscience from within the Romulan command structure.

RY 1998 / TY 2367 — Borg Incursion on Romulan Frontier
The Borg emerge as an existential external threat.

RY 1999 / TY 2368 — Attempted Invasion of Vulcan
A bold but unsuccessful effort to rewrite ancient history.

RY 2000 / TY 2369 — Defection of Vice-Proconsul M’ret
Another crack in the facade of absolute loyalty.

RY 2002 / TY 2371 — Cloaking Treaty Amendment; Klingon Attacks
Romulans permit limited cloak use while Klingon aggression resumes.