Citadel/Legends

The Citadel was a heavily guarded Confederacy of Independent Systems prison during the Clone Wars. It was run by a warden that was considered to be sadistic. At one point, Jedi General Even Piell was captured and incarcerated in the prison, prompting an elite rescue team led by Jedi Generals Obi-Wan Kenobi and Anakin Skywalker to free him.