For the native species of this planet, please see Triannon.
Triannon was an inhabited planet located in the Muratas Star Cluster in the Delphic Expanse; it was home to the Triannon people. It was located 6.3 light years from the 12th Sphere.
From the 2050s, Triannon was wracked by a religious war. This war finally ended in March 2153, but at a terrible cost. Both sides were decimated, all the major cities were destroyed. Millions of Triannons were killed. (ENT: "Chosen Realm")
In the final draft script of "Chosen Realm", the devastated surface of Triannon was referred to as the planet's capital city.
A deleted scene contained a picture of the surface of Triannon before destruction hit.
According to StarTrek.com and the Star Trek Encyclopedia, 4th ed., vol. 2, p. 418, Triannon was a M-class planet. [1](X)