Celos

Celos (pronounced KEL-ohs) was the name of two different planets in Star Trek: Arcadia.

One planet lay along the Alpha-Beta Quadrant border. In the 23rd century it was part of territory hotly contested between the Klingon Empire and the Federation.

Another was home to a scientist who studied the planet Horuulk in the Romulan Neutral Zone before 2382.