Colonized during the early exodus from Terra, Pleione became a stepping-stone to the stars beyond. Though the planet is an inhospitable desert world, it has an abundant supply of water, which it exports on a regular basis. The landmass is less then 20 percent of the planet, limiting population growth to the lone continent of Jezrael. Most of the terrain is nearly featureless, save for large rock formations that dot the land. Pleione can barely grow agricultural products, so it must import the majority of the agricultural products needed to support the population.
Pleione was once a member of the Tikonov Grand Union before joining the Capellan Confederation. The original Star League used Pleione as a military supply world and built a massive fort atop the largest rock formation on Jezrael. This fort was used as a headquarters and regimental supply depot. The Capellans named it "Thunder Rock." It was here that Capellan forces fought against Davion mercenaries during the Fourth Succession War. Confederate forces were able to regain Pleione once the Sarna March collapsed as the result of the Marik-Liao invasion of 3057.
During the Confederation's Xin Sheng movement, Pleione, along with Ningpo and Poznan, reaffirmed its allegiance to the Celestial Throne and House Liao. To ensure the defense of the world, the Confederation assigned Little Richard's Panzer Brigade to defend Pleione, as well as to back up Confederation forces on Ningpo and Poznan. During the FedCom Civil War in October of 3066, the Brigade was sent by the CCAF to take Genoa and Arboris. It was on Genoa that Little Richard met with disaster at the hands of Twelfth Vegan Ranger's Beta Regiment. In a matter of a month, the defenders of Pleione were sent home, their regiment reduced to a barely operational battalion.