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Eisn (also known as Ket-cheleb or Stelam Rom'lnz or 128 Trianguli) was a spectral class G9 white star, primary of the Romulan system. The Federation name for the star was Romulus. (TNG video game: Echoes From the Past)

This area contained the home planets of the Romulan Star Empire, Romulus and Remus, as well as the moons Pirek and Elvreng. The system had a secondary star which is known as Romulus B. (TOS - Rihannsu novels: My Enemy, My Ally, The Romulan Way)

During the final battle of the Romulan Civil War in 2276, the crews of the USS Enterprise and ChR Bloodwing created a link between Eisn and Sol to defeat an attempt by the Three to destroy the Sol system with a sunkiller bomb. Ael t'Rllaillieu said in a public address that this event permanently bound the two stars together and any future attempts on either star would likewise affect the other, though she was bluffing. (TOS - Rihannsu novel: The Empty Chair)

In 2387, Eisn was destroyed with the rest of the system in the shockwave caused by the Hobus supernova. (ST comic: "Countdown"; TOS movie, novelization & comic adaptation: Star Trek; STO website: The Path to 2409)


There were at least seven planets in the system:

The Rihannsu novels state that the system contained six planets whilst FASA material indicates that there were seven but the latter only numbers six as Remus orbits Romulus.



Iota Pavonis sector block
bordered locations: Iota PavonisAlpha Centauri sector blockFederation-Romulan Neutral ZoneEridan Belt
sector Z-6 Fvillhaih system (Fvillhaih IFvillhaih II) • Lirss system (Lirss Prime) • Vhoran system (Vhoran)
Iconia system Iconia IIconia (Iconia's inner moonIconia's outer moon)
Tarod sector
Romulan sector/sector 30
Dimorus system (DimorusDimorus IIDimorus II-A) • Great Bloom/Bassen RiftK'shan system (K'shan) • Lonco system • Sarita system (Sarita III)
Romulus system Eisn/Romulus B: I. Aranusia • IIA/B. Romulus/Remus • III. S'latas • IV. D'lanam • V. Ulunam • VI. Trijth
Bolarus sector
Bolian/Tango sector
Breshar system • Ch'menira system • Llaiir system • NGC 1218Ponor systemRashana system • system Y
Bolarus system I. Se'ka • II. Krith • III. Bol'turFirst Bolarus asteroid belt • IV. Harmar • V. Bolin • VI. Tha'lat • VII. Ral'narSecond Bolarus asteroid belt • VIII. Sol'nar • IX. Bolarus IX • X. Motal • XI. Sernar • XII. Sath • XIII. Ki'siu
Devron sector Aihai system • Cero system • Delta Corvi system • Devron system • Fitzan system • Hobus system
Stars, systems and objects of the constellations of Triangulum and Triangulum Australe
15 Trianguli113 Trianguli114 Trianguli123 Trianguli ~ 128 Trianguli (Romulus system) • 4408 Trianguli553 Trianguli658 Trianguli766 Trianguli872 TrianguliAlpha TrianguliBeta TrianguliEta TrianguliGamma TrianguliIota TrianguliPhi TrianguliRV TrianguliSigma-285 TrianguliTriangulum GalaxyZeta Trianguli Australis
Stars, systems and objects of the Perseus constellation
139 Persei (Romulus system)218 Persei29 Persei44 Persei (Zeta Persei)Alpha PerseiBeta Persei (Algol)Iota PerseiKappa PerseiLambda Persei (Typerias)Omicron PerseiPerseus ArmZeta Persei (44 Persei)
Romulan stars and star systems
1 Centauri12 Canum Venaticorum123 Trianguli (123 Trianguli A123 Trianguli B) • 128 Trianguli (128 Trianguli A128 Trianguli B) • 139 Persei (139 Persei A139 Persei B) • 17 Circini34 Aquarii6 Arietis74 Tauri78.56/3.54/23.448 Canum VenaticorumAbraxasAchernarAcruxAgurthaAinAlgorabAlpha AquariiAlpha Canum VenaticorumAlpha ChamaeleonisAlpha CirciniAlpha EridaniAlpha HydriAlpha OniasAlpha PictorisAlpha VolantisArtaleirh (star)AtriusAviorBelak systemBestariBeta ArietisBeta Canum VenaticorumBeta ReticuliBeta VolantisB'levBrutusBuqretBu'uli TevCarrayaChaltokCharaCor CaroliCorillCorvus systemD'deridexDasha VertaDelta CorviDelta HydriDelta PhoenicisDelta VelorumDevorasDevorrenDewaDidactiD'KorinDrovnaDumok'azenEisn binary system (EisnEisn B) • EnnarEpsilon CarinaeEpsilon PhoenicisEpsilon TauriEta AntliaeEta CorviEta CrucisEta HorologiiEta TauriEye of GrunEye of Ket-ChelebFarlornFelussusGacruxGamma CraterisGamma CrucisGamma MensaeGamma TucanaeGaskoGeilodGentaraGlintaraGotannaGotaraHaakona systemHobusHyberai CentauriIota CarinaeIota HydriJezerekJustarusKapor'AtKappa TucanaeKe KwanusKet-cheleb binary system (Ket-cheleb AKet-cheleb B) • KevratasKhazara systemKirKrotarLambda CraterisLangusLeughonMakarMedusa systemMelikMenkentMira MajMu HorologiiMu VelorumNequenciaNew OthaNu OctantisOssecOtha PrimePallorPaxarPerenPi MensaePollusProsennaPsi VelorumQuatelRatorRedanskRegulusRho TucanaeRho VirginisRomii systemRomulus (Romulus ARomulus B) • RouleanRuchbahSaliehSamnarSandalSankraxSantoraSar'kellSheratanSoltarisStelam DelethamStelam Rom'lnz binary system (Stelam Rom'lnz AStelam Rom'lnz B) • TalvathTegedaarTerix/TerixTeutilTheta CentauriTigelisT'MetTorekTranome SarUmbriosUnrothUstullanVendorVertiliaXhujXi HydraeYagraYatilZaxx'nZeta Trianguli AustralisZeta PictorisZeta VolantisZevarus RomulanEmblem

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