Grand viziers were high-ranking officials in the Ottoman Empire who served as advisors to the sultan. Synonyms for grand viziers include prime minister, chief minister, grand chamberlain, Grand Wazir, or Grand Vizir. The duties of grand viziers varied but generally involved managing the empire's government, economy, and military affairs. They were responsible for ensuring the sultan's orders were carried out and for maintaining law and order. In modern times, the term grand vizier is still used to refer to high-ranking officials in some Middle Eastern countries. Synonyms for grand viziers can be used interchangeably to refer to any high-ranking government official who advises the leader of a state or nation.