Deneva

Deneva (or Deneva Prime) was a planet located in the Alpha Quadrant and was the location of a Earth colony established in the 2140s. Shortly after the element trivium is discovered in Deneva's asteroid belt. By the 2150s, Deneva was a key port, with many cargo vessels making runs to the asteroid belt. ("Medical Reference Manual" and ENT episode: "Horizon").

As the colony continued to grow in the late 22nd and early 23rd centuries, a scientific base started to develop on Deneva, which drew many scientific minds from all over the Federation.

Disaster struck Deneva in 2267, when a visiting transport ship from Ingraham B, brought deadly neural parasites with them, that took over the colonists minds, and make them build spaceships so they can spread their influence. Fortunately, their plans were halted by Captain James T. Kirk and the crew of the USS Enterprise (NCC-1701). (TOS novelization: "Operation: Annihilate!", Star Trek 2).