Grand Vizier, Sadr-ı Azam (Sadrazam) or Serdar-ı Ekrem (in Ottoman Turkish "صدر اعظم" or "وزیر اعظم"), was the most important minister of the Sultan. The Grand Vizier had absolute power of attorney and could only be removed by the Sultan. He held the imperial seal and he could gather all other viziers to attend meetings regarding state affairs. The title is derived originally from the Persian word "Vizier" (وزير). The title of Grand Vizier corresponds to that of a prime minister.