In the Ottoman Empire, the Grand Vizier was the prime minister of the Ottoman sultan, with absolute power of attorney and, in principle, dismissible only by the sultan himself. He held the imperial seal and could convene all other viziers to attend to affairs of the state; the viziers in conference were called "Kubbealti viziers" in reference to their meeting place, the Kubbealti ('under the dome') in Topkapi Palace. His offices were located at the Sublime Porte.