Galen IV
Galen IV was the formerly inhabited fourth planet of the Galen system, in the Alpha Quadrant. This forested planet had no moons and was home to the Federation Galen IV colony.

The Federation had established first contact with this planet by 2259. ()

During the late 2350s, Galen IV was disputed between the Federation and the Talarian Republic, who saw the Federation as encroaching on their territory. In 2357, the planet was attacked during the Galen border conflict by Talarian forces, commanded by Endar. All the colonists were believed to have been massacred, the colony destroyed, but a single survivor emerged years later as Endar's adopted son Jono. ()

Appendices

Background information 
This planet's quadrant of origin is inferred based on the position of the Talarian Republic as seen in the star chart appearing in the  episode .

The  classified Galen IV as a M-class planet and located it in the Galen system.

According to  Star Trek: Star Charts (p. 37, "United Federation of Planets I", "United Federation of Planets III") and  Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), Galen IV was located in the Galen system. The primary of this system was a K-class star. Galen IV was listed as a Federation member in 2378.

External link 
 

cs:Galen IV
de:Galen IV
nl:Galen IV
Galen 04