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Trill, also called Trillius Prime, is the homeworld of the two species jointly known as the Trill. The planet has a blue-green sky, and the rocks are bluish in tint. (DS9 episode: "Equilibrium"; ST reference: Star Charts)

It was located in the Trill system in the Alpha Quadrant's Trill sector. (STO video game: Delta Rising; ST reference: Star Charts)

The planet is canonically referred to as "Trill" in "Equilibrium". Star Trek: Star Charts establishes "Trillius Prime" as an alternate name. Star Trek Online refers to it as "Trill" in a duty officer assignment, while using "Trillius Prime" in the overworld. Star Trek Timelines establishes the planet as "Trill" and its star as "Trillius Prime".


Trill's first contact with alien life was in the early 21st century, when a Vulcan ship landed, proposing friendship and cultural information exchange. Trill society was deeply divided by this development, with many fearing the outsiders represented a threat to the symbionts. The ruling council eventually allowed for limited contact with Vulcans, but no other alien races. This first contact also led to increased security around and secrecy regarding the symbionts.

In 2075, Trill was visited by the L'Dira. Trill's refusal to deal with the unknown race led to an attack on the planet, killing over fifty. This tragic error in understanding convinced the ruling council to increase their knowledge of the galaxy. (DS9 short story: "First Steps")

The planet joined the United Federation of Planets some time around the early 23rd century; before that the planet's military was the Trill Private Service. (TNG novel: Intellivore) Madza Bral, a Trill politician, was elected Federation President not long afterwards. (ST novel: Articles of the Federation)


Trill Emblem

In the 21st century, Trill was governed by a ruling council, composed solely of joined Trills, and primarily males. The council was led by a head counselor, addressed as "Mr. Speaker". The council met in the council chambers, at the time one of the oldest and largest spaces in the capital city, adorned with acelon desks and capped by an opaque dome. As early as the mid-21st century, debate raged over abandoning the historic chamber for more modern building. (DS9 short story: "First Steps")

By the 24th century, Trill government was run by a President and a Senate, both housed in the Trill Senate Tower, in the city of Leran Manev. That government nearly collapsed when a terrorist attack killed or seriously wounded thousands of symbionts, including that of the president, Lirisse Maz. The Maz symbiont was successfully unjoined, and Lirisse Durghan was able to maintain her position. (DS9 novel: Trill: Unjoined)


The largest mountain range on Trill is known as Ayai'leh-hirh. The largest mountain is Bes Manev.


Important Buildings

Natural History





Alternate timeline

In an alternate timeline in which Khan Noonien Singh won the Eugenics Wars and Humanity underwent genetic engineering en masse, the Khanate of Earth conquered Trill during the 21st century. The Trill remained helots of Humans well into the 24th century. (DS9 - Myriad Universes novel: Seeds of Dissent)


the planet Trillius Prime
cities and settlements BanaB'tarChi'tarGheryzanIklanKuralLeran ManevMak'alaMuronaNew ScirapoShatorTear'cTreshVransYmoc City UFP emblem. Trill emblem.
landmarks and geography Ayai'leh-hirh (Mount ArkenIlrienhNoraikgheOraidheSethe) • Caves of Mak'alaDeln MountainsDevritane MuseumDorabi subcontinentDorvan minesGanses PeninsulaHoobishan BathsIrnek PeninsulaKem'alta InstituteKorchub MountainsLekarna MountainsManevriNajana LibraryNalep MountainsTash MountainsTenarTenara (Tenaran Ice CliffsTenaran Music Academy) • Thorain MountainsTrill Senate TowerUrot MountainsVenar MountainsVor'lan mines
bodies of water Aldar BayDara'air OceanLake DevritaneLake OgralsManev BaySea of ArlibathTroyval OceanTurek SeaUzonn Ocean
lifeforms cutter termiteeomrekerfeather-apefenza birdilrienhmrekermudcrawlernoraikghesethesilikh flyskutfishyilga moth
planets visited by ships named Defiant
USS Defiant (NCC-1764) GolmiraTraelus II
USS Defiant (NX-74205) (I) 2371 KaremmaCallinon VIIFounders' homeworldTrillCardassiaMeridianOrias IIIEarth
2372 BajorCha'XirracFree HavenVandros IVclass L planet crash siteNew Founder homeworld
2373 Torga IVAjilon PrimeCardassiaSolosos IIIGaia IV
2374 Argolis Cluster planet • Chin'toka planets
2375 AR-558
USS Defiant (NX-74205) (II) Europa NovaTorona IVNarendra IIIVahni Vahltupali homeworld • PrentaraLuthiaBajor
Defiant (mirror universe) Bajor

External link