DS5 vicinity

Map of the area between Deep Space 5 and the Romulan Star Empire.

The former site of the Thallonian Empire was known on Starfleet charts as Sector 221-G.

The Thallonian Empire was located in the space between Deep Space 5 and the Romulan Star Empire. (NF novel: House of Cards; TNG - Double Helix novel: Double or Nothing)

The Thallonian Empire was an extremely xenophobic society that did not allow unauthorized trespass. The penalty for traveling within Thallonian space without authorization was death.

The Thallonian Empire fell in the year 2373, due in part from the actions of a rival species, the Danteri, who engineered a coup on Thallon that left most of the Thallonian royal family dead.

One of the sole survivors of the Thallonian royal family, Si Cwan, formed the democratic New Thallonian Protectorate in (approximately) 2377. (NF novels: House of Cards, After the Fall)

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major states in the Alpha and Beta Quadrants
Khitomer Accords Signatories Cardassian UnionFerengi AllianceKlingon EmpireUnited Federation of Planets
Typhon Pact Breen ConfederacyGorn HegemonyHoly Order of the KinshayaRomulan Star EmpireTholian AssemblyTzenkethi Coalition
Alpha Quadrant Alliance Cardassian UnionDeferiFerengi AllianceKlingon EmpireRomulan RepublicUnited Federation of PlanetsVoth Separatists
non-aligned states CortDaa'Vit ConfederacyDanteri EmpireFirst FederationGottar HegemonyGrigariHydran KingdomInterstellar ConcordiumJibetian ConfederacyKarg EmpireKzinti PatriarchyLyran Star EmpireMentosh AssemblyMetron ConsortiumNew Thallonian ProtectorateNyberrite AllianceOrion ColoniesPatriarchyRegnancy of the Carnelian ThroneSattar CollectiveSheliak CorporateShirn AllianceTalarian RepublicTarn EmpireTezwaTirrion AssemblyUbarrak PrimacyVenette ConventionVomnin Confederacy
defunct states Thallonian EmpireImperial Romulan StateZalkat Union
states unique to the mirror universe Galactic CommonwealthKlingon-Cardassian AllianceTerran EmpireTerran Republic
states from other alternate timelines AllianceInterstellar CoalitionInterstellar UnionKlingon-Andorian CompactVulcan-Andorian Empire
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