A vizier is a high-ranking political advisor or minister in certain historical Islamic states, particularly during the Abbasid and Ottoman empires. They were responsible for overseeing government administration, implementing laws, and advising the ruler on various matters, including military and economic issues. The role of a vizier often included managing state affairs, leading councils, and representing the ruler in diplomatic matters. Viziers held significant power and influence, sometimes acting as the de facto leader when the ruler was unable to govern effectively. Their position was crucial in maintaining the stability and efficiency of the state.