A Grand Vizier is the chief minister in certain historical Islamic empires, particularly the Ottoman Empire. This high-ranking official was responsible for overseeing the administration of the state, implementing laws, and advising the Sultan. The Grand Vizier often held significant power, sometimes acting as the de facto ruler when the Sultan was unable to govern. The role of the Grand Vizier included managing military campaigns, handling diplomatic relations, and supervising the bureaucracy. They were supported by a council of advisors and could be influential in shaping policies. The position was crucial for maintaining the stability and efficiency of the empire.