Bastion was a planet in the Imperial Remnant and the Outer Rim.
Tyrani Pellaeon was from Bastion. Aurelius Tempest once helped fortify the planet during the Yuuzhan Vong War. Tempest would later attempt suicide there.
In 10 ABY, a massive battle took place there between the forces of the Galactic Empire, led by Grand Admiral Eon, and the New Republic. It was a crushing victory for the Empire, and the New Republic took massive casualties that they never recovered from and the casualties even affected the later Galactic Alliance.
During the Confederation of Free Planets era, the Chief of State built a palace there. It was later the capitol of the New Galactic Empire, after it replaced the Confederation.