Grand Moff was the title given to the Regional Governors of Oversectors. These sectors, also called Priority Sectors, were locations that were of special interest to the Emperor. These included the Imperial capital of Coruscant and the Death Star. The system was used by a number of governments: Odile Vaiken was the first Grand Moff of the Sith Empire, while Wilhuff Tarkin was the first Grand Moff of the Galactic Empire, and held authority over multiple Priority Sectors.