Flensus was a Planet in the Unknown Regions, that serived as a military base & testing ground for the Thrid Sith Empire, Galactic Empire, and thier succesor. Many secret weapons were developed by the Admirals staitioned there. During the Justice Wars, it serived as the capital of the Flensus Imperium. After the Second Battle of Flensus in 150 ABY, Flensus became part of the Galactic Federation.