The Citadel was intended as a flawless contingency for an unthinkable problem -- the stark prison was built to hold Jedi, should any in the Order ever turn against the Republic. Constructed 500 years before the Clone Wars, it fell to Separatist control when the planet Lola Sayu was conquered by the Confederacy early in that conflict. The Separatists populated the prison with battle droids, and used it to hold Republic captives. It is an imposing, heavily armed fortress seated atop a monolithic butte.
An ambitious, ruthless proponent of military power, Wilhuff Tarkin became a favorite of Supreme Chancellor Palpatine and rose rapidly through the Imperial ranks. Shortly after the Empire's creation, he was put in charge of the construction of the Death Star. Tarkin saw the Death Star as a way to crush all dissent to the Empire's rule -- fear of the station's planet-killing superlaser would keep the galaxy's star systems in line. He demonstrated the station's power by destroying Alderaan, but died soon afterwards when the Death Star itself was destroyed.
Discovered as a slave on Tatooine by Qui-Gon Jinn and Obi-Wan Kenobi, Anakin Skywalker had the potential to become one of the most powerful Jedi ever, and was believed by some to be the prophesied Chosen One who would bring balance to the Force. A hero of the Clone Wars, Anakin was caring and compassionate, but also had a fear of loss that would prove to be his downfall.
A gruff and battle-hardened Jedi as well as senior member of the Jedi council, Even Piell was bigger than life though he was small in stature. Highly skilled with a lightsaber and a great warrior, Piell was always willing to charge into battle. During the Clone Wars, he was tasked with some of the most crucial missions, protecting vital Republic territory and information.