Star Trek: The Cantabrian Expeditions Wiki

The Jenchum Suzerainty was a political entity formed around the Jenchum species, including various colonies like Goffan III and planets like Goffan IV.

In 2367, they attempted to create a subspace weapon to either deter or use against the Enipians in their attacks on Goffan III. The laboratory, in the city of Enika, was encased in molocine, which, when the test failed, prevented a subspace anomaly from spreading further. The entire scientific and military team within the testing area died.

They also had their own battle cruisers.

The authorities let the artist caste have a wide berth.

The Jenchum Suzerainty was part of The Directorate. (Star Trek: The Prospect Chronicles: "Starry, Starry Night")

A suzerainty is a controlling government, allowing subordinates to create their own laws, et cetera, controlled by an overarching authority. We assume the Jenchum Suzerainty was based on the Jenchum home world (if there was one) and local branches existed on each inhabited planet, including Goffan III.