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Romulus was the adopted homeworld of the Romulans and capital planet of the Romulan Star Empire. The planet was also known as ch'Rihan (lit. "of the Declared" in the Romulan language) and 128 Trianguli III-A (in the astronomical notation of Earth). In yet another language, the planet was known as Rom'laas, and in another catalog system, Ket-cheleb III. Romulus was the third of ten planets, and its tidally-locked "sister world" was known as Remus. Together, Romulus and Remus were sometimes called the Hearthworlds. Remus and the planet Romulus had a "Trojan relationship" in the way they revolved around each other. The sun around which Romulus orbited was known as Eisn.

Romulus was a lush, humid world abundant with vegetation and large bodies of water, and was designated a Minshara class world. The planet had two moons, Pirek and Elvreng. (TOS novels: Rihannsu: The Bloodwing Voyages; Last Unicorn RPG module: The Way of D'era: The Romulan Star Empire; TNG video game: Echoes from the Past)

The third novel in the Vulcan's Soul trilogy, Epiphany, has a mention of the sister world of Remus possessing four moons.

The Klingon name for the planet, romuluS, is derived from the Federation Standard name. (tlhIngan Hol reference: Klingon for the Galactic Traveler)


Romulus vicinity.

The planet was noted as being rich in different kinds of organic life with a climate far better then what was present on Vulcan with abundant supplies of water with much larger seas. Varying types of habitations were also present from deserts to volcanic regions with firefalls. Though it was rich in organic life, its metal content was somewhat rarer with much of it being present deep within the planet, which was a contrast to the world's sister planet. (TOS - Vulcan's Soul novel: Exiles)

As such, it was seen as a resource poor world compared to its sister planet with Romulus lacking fossil fuels, hard metals and radioactive materials. (FASA RPG module: The Romulans)

Transporter beams were typically not used for interplanetary travel on the home world. (TNG novel: Dead Zone)

Romulus on the explored galaxy map.

Romulus was noted on star charts of the galaxy's explored regions in the 23rd and 24th centuries, in an area of the projection also containing Remus, Ingraham B and the Romulan Neutral Zone. (TOS movie: The Undiscovered Country, TNG episodes: "Conspiracy", "The Measure of a Man", "The Emissary", "The Mind's Eye", "The Game", DS9 episodes: "In the Hands of the Prophets", "Cardassians")


See also: Romulan history

Historians believe that Romulus and its sister world of Remus were in fact once a single large planetoid known as Romii. The biggest change that geologists have determined to have to Romii was five-point three billion years ago when another planetary body, which was at least sixty percent the size of Romii and in retrograde orbit, collided with the large planet. The impact stripped the outer crust from Romii and, in less then two hundred years, the ejecta had coalesced into a single body that would eventually cool to become the planet known as Romulus which would continue to spin with the force of that ancient catastrophic collision. (TOS novel: Captain's Blood)

According to one account it was named by the Vulcan Exiles after an ancient myth of twin god-brothers. Another account said that the planet was named after the mythical home of the Vulcan god Ket-cheleb known as Rom'laas. Terise Haleakala-LoBrutto, a human anthropologist who lived among the Romulans in secret for many years, maintained in her magnum opus The Romulan Way that the names Romulus and Remus were assigned by Federation explorers. (Last Unicorn RPG module: The Way of D'era: The Romulan Star Empire; TOS - Rihannsu novel: The Romulan Way)

Sometime in the 23rd or 24th century, Kor attacked the world. Also, at some point, Elim Garak served as a gardener on the planet. (ST website:

In 2376, this was listed as the host location of a current or past marathon. (New Worlds, New Civilizations short story: "The Footfalls of Tradition")

Romulus was completely destroyed when the Hobus star went nova in 2387. Prior to the destruction, Spock attempted to warn the Romulan Senate that the supernova posed a threat to both the planet and the entire Romulan Star Empire, but was rebuffed. However, a few weeks later, the Romulan Senate observed that the Hobus star was increasing in mass and was growing more unstable which led to them concluding that Spock was correct. A scientist predicted that it would take a few weeks at most for the shockwave to reach Romulus once the star went nova. Praetor Chulan proclaimed he would put the matter up for vote in the Senate, then gave the order to begin evacuation protocols for Romulus.

The shockwave from the Hobus detonation proved so violent it breached subspace and propagated far faster than the speed of light, reaching the Romulan system in only 27 hours. The entire system was obliterated and billions of Romulans and Remans died. The praetor was among the survivors and promised that the empire would survive, and that he would find his people a new home. However, Chulan and the survivors of the Senate were killed by Nero soon after in revenge for their prior inaction. (ST comic: "Countdown"; TOS movie, novelization & comic adaptation: Star Trek; STO website: The Path to 2409)

Alternate timelines

In the "anti-time" future to which Q helped Jean-Luc Picard travel, the year 2396 saw an outbreak of Tarellian plague on Romulus. (TNG episode: "All Good Things...")


Romulus is defended by the "Kaur'el Tennahrex" (the High Fortress), a massive orbital defense platform. The orbital battle station was originally built in the 22nd century. The battle station was upgraded and expanded in the 23rd century, and again in the mid-24th century. It was a space station with 50 docking ports for the D'deridex-class Warbirds or smaller warships, and 200 docking ports for smaller vessels.

The Kaur'el Tennahrex had a crew of 4,325, an additional 2,770 inhabitants, and had a maximum capacity of 27,500. It was equipped with 35 tractor beam arrays, 40 personnel transporters, and 80 cargo transporters. The station's defenses consisted of a deflector shield, 50 plasma torpedo launchers, and Type S Disruptor cannons. The battle station also controlled a huge network of smaller defense satellites which were scattered around the planet and nearby space. Assigned to the station were 6 D'deridex-class warbirds, 24 smaller warships, 12 warp shuttles, 12 scout ships, and 100 work bee-type craft. (Last Unicorn RPG module: The Way of D'era: The Romulan Star Empire)


Romulus surface map.

Romulus surface map.

Romulus surface map.

Planet Romulus.


Bodies of water

Apnex SeaBalsanra RiverBareldak BayD'Gansar RiverDorvek RiverGarenah Sea/Garenak SeaGend'eroth RiverHaverelar SeaH'relgath RiverJendraax Strait/Jendranax StraitSea of LerodanNelrek OceanNorth Mendlanar SeaSherdak Sea/Sherelak SeaSouth Mendlanar SeaTai'eld RiverTerelex Straits/Terelix StraitsThal'Tharin RiverTor'ren RiverSea of VrekessWhite Sea

Continents (and Provinces)

Geographic Features

Cities and Settlements

Points of Interest

Moons and Satellites

Whilst LUG states that Romulus has two moons, the Vulcan's Soul book Epiphany states that it has in fact four though they are not named.

Natural History



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Romulan planets and planetoids
83 Leonis B V872 Trianguli VAbraxas VAbraxas IXAbraxas PrimeAchernar IIAchernar PrimeAcrux IXAin IAlcyone IIAlgeron IIIArachnaeArtaleirhAssaf GolavAtrius VAvior VIIIB'Lev IBardatBestari XBrozBrutus XBu'Uli Tev IIICeles IIChalChaltok IVChara XCheronChetzia IIIChulConstanthusCor Caroli IXCor Caroli VCortCorvus VIIICrateris colonyDevoras planetDidacti IVDiWahnD'ravasasz IVDrovna IIIElohGarthosGasko IIGemma VIIGibraltarGirgaGlintara IGotanna IIIHellguardIzar IVKalabestaszKallionKarrKe Kwanus VKevratasKhazara planetLevaeri VMakarMireMelik VMira Maj VIMirhassaNequencia colonyNew RomulusNimbus IIIPersevus IIIPilum IVPlacidus IIPrimus IVRalatakRator IIIRator IVRemusRhei'llhneRomiiRomulusRotronSadallSadat VISalaHSandal IVSantora PrimeScheat IIIScutulum IIISeginus IISheratan VIISithoiSitula ITalvath colonyTartalusTerix IIThieurrullUnroth IIIVirinatXanitlaZaxx'n VIZevarus Prime Romulan Empire emblem image.
planets visited by the USS Enterprise (NCC-1701-E)
EarthElamin IXAlgenib IISalva IVChiaros IVKendarayDenobulaGalor IVGornarBetazedRaknal VBa'kuHalkaPrimus IVGemworldTaDBlossom IVTerra GalanBajorNarendra IIIPelleus VSolosos IIIDavlos VICygnet IVMyrmidonTezwaKolarus IIIRomulusTolochon IIDokalaan homeworldDokaalan colonyCarreaDelta Sigma IVGorsach IXTrophy WorldRamatis IIIFromander IVVulcan
planets visited by the USS Titan
MarsRomulusOghenIota Leonis IILumbuOrishaKestra IINew ErigolKnnischlinnaikDoornailHranrarEarth
explored galaxy map
states and organizations First FederationTholian Assembly Explored galaxy map.
regions KlingRomulan Neutral ZoneSarpeid
stars and systems AldeberanAlpha CarinaeAlpha CenturiAlpha MajorisBeta AurigaeBeta GeminorumBeta LyraeBeta NiobeBeta PortalanCapellaDenebEminiarFabrinaGamma TrianguliIngraham BOmega CygniOrionPallas 14PhylosRegulusRigelSiriusSolTalosTau Ceti
planets and planetoids Alfa 177Altair VIAndorArretAriannusBabelBeneciaBerengaria VIICamus IICanopus IIIDaran VGamma Canaris NHolberg 917GJanus VIKzinLactra VIIMakus IIIMarcos XIIMarnak IVMemory AlphaMuddOmega IVOrganiaPollux IVPsi 2000Pyrix VIIRemusRomulusTheta IIIVulcan
capital planets and cities
Khitomer Accords alliance Cardassia City, Cardassia (Cardassian Union) • Ferenginar (Ferengi Alliance) • First City, Qo'noS (Klingon Empire) • Paris, Earth (United Federation of Planets)
Typhon Pact Ansirranana, Breen (Breen Confederacy) • Gornar (Gorn Hegemony) • Ki Baratan, Romulus (Romulan Star Empire) • Rashtag, Janalwa (Holy Order of the Kinshaya) • Tholia (Tholian Assembly) • Tzenketh, Ab-Tzenketh (Tzenkethi Coalition)
non-aligned states Dinaal City (Dinaal IV) • Empersa (Dominion) • Guwine, Venette (Venette Convention) • Keelee-Kee, TezwaL'hur (Sikaris III, Sikarian Canon) • Me'leit, Talar (Talarian Republic) • New Romulus (Romulan Republic) • Nova Roma, Rator III (Romulan Star Empire, post-Hobus) • Rexlar-D, Dosi (Dosi Confederation) • Zahlnerest (Zahl II, Zahl Regnancy)
Mirror Universe States Deneva (Galactic Commonwealth) • Okinawa, Earth (Terran Empire) • Okinawa, Earth (Terran Republic)
Federation member states Ares City (Confederated Martian Colonies) • Ashalla (Republic of Bajor) • Iaron (Damiano) • Leran Manev (Trill) • Lor'Vela (Andorian Empire) • New Coridan (People's Republic of Coridan) • New Samarkand (Alpha Centauri Concordium of Planets) • Nuvia (Risian Hedony) • Pike City (Cestus III) • San Francisco (United Earth) • ShiKahr (Confederacy of Vulcan) • Stratos (Ardana) • Zhelnogra (Tenara)
Federation member state subdivisions & colonies Eau Claire (Belle Terre) • London (United Kingdom, United Earth) • Madrid (Spain, United Earth) • New Burbank (Rigel VI, United Rigel Colonies) • New Rakantha (New Bajor, Republic of Bajor) • Oslo (Norway, United Earth) • Port Emily (Sherman's Planet) • Rigel Trade Complex (Rigel X, United Rigel Colonies) • Washington, DC (United States, United Earth) •
interstellar state subdivisions Ka'Hat (Sherman's Planet, Klingon Empire) • Kecemen (Karemma, Karemma Foundation, Dominion)
defunct interstellar states Achernar Prime (Imperial Romulan State) • Thal, Thallon (Thallonian Empire) • Unimatrix 01 (Borg Collective)


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