Historically, a vizier is a high-ranking political advisor or minister in the countries of "greater Persia". The Abbasid caliphs gave the title wazir to a minister formerly called katib, who was at fi
An illustrated Portrait of Muhammad Shah Qajar and his Vizier Haj Mirza Aghasi in Iran during the 19th century. Vizier's roles as advisors in courts evolved over time, becoming an important part of official government institutions.