The Imperial Seat is located inside Blackrock Depths, and is the innermost chamber of the instance. It is the throne room of Emperor Dagran Thaurissan, and home to the Shadowforge Senate and Twilight's Hammer ambassadors.
This large room has many mixed groups of dwarves, with the Emperor and Princess Moira Bronzebeard sitting at the end. The room must be cleared before engaging the Emperor, as he will call them all to his aid when he aggros. The princess is a dedicated healer; if the players are attempting the quests or , she must be kept alive until the Emperor is killed. She will then automatically turn into a 'friendly' quest ender. You can sit on the throne here.