Agbar IV was a planet located somewhere in the space of the galaxy's Alpha or Beta Quadrants, the fourth planet in orbit of the Agbar star system.
History and specifics[]
In the year 2218, the Federation starship USS Ranger was sent on a first contact mission to Agbar IV. The mission took a disastrous turn, and the Ranger was destroyed by a Klingon attack. (Decipher RPG module: Starfleet Operations Manual)