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Troyius was an inhabited planet, the outer of the two, the other being Elas, found within the Tellun system in the Alpha Quadrant. This was the homeworld of the Troyians, a spacefaring humanoid species.

In the mid-23rd century, this planet's system was located in a border area near the Federation-Klingon border.

In 2256, this planet was mentioned with the star system's name on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the USS Discovery. (DIS: "Magic to Make the Sanest Man Go Mad")

In 2257, during the first Federation-Klingon War, this planet's system was occupied by the Klingons. (DIS: "The War Without, The War Within")

In 2258, the planet's location was labeled on a star chart seen on the main viewscreen of the USS Enterprise. (DIS: "Such Sweet Sorrow, Part 2")

In 2259, the location of this planet was labeled on a stellar cartography chart that was seen on the USS Enterprise's ready room viewscreen. This planet's symbol had a blue color, indicating that it was affiliated with the United Federation of Planets. (SNW: "Strange New Worlds", "Children of the Comet", "Spock Amok")

The planet had rich deposits of dilithium ("radan" in the Troyian language). In 2268, both planets possessed the capability of mutual destruction. The wedding of the Dohlman of Elas, Elaan, to the ruler of Troyius preserved the peace. (TOS: "Elaan of Troyius")

The planet's location was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters in 2399 and on the bridge of the USS Titan-A in 2401. Troyius was in or near to Federation space. (PIC: "Maps and Legends", "The Next Generation", "Disengage")

In 2401, this planet's position was labeled on a star chart used by Captain William T. Riker during his attempt at finding the last known location of the SS Eleos XII. (PIC: "The Next Generation")


Background information[]

According to Star Trek: Star Charts ("United Federation of Planets I"), in 2378, Troyius was a Federation member.


According to FASA's The Federation sourcebook, Troyius is the fifth planet in the Tellun system.

The Star Trek: The Original Series - Core Game Book says it's the fourth planet in the system.

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