Sector 56 was a specific sector located within the galaxy, housing a particular system. During the year 2 BBY, rebels within this star system posed a danger to Imperial transport vessels. To address this, Grand Admiral Mitth'raw'nuruodo, also known as "Thrawn", engaged and triumphed over these dissidents in an engagement. Following this victory, he communicated his accomplishment to Emperor Palpatine while at the Imperial Palace situated on Coruscant.