Divan
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A divan or diwan was a high government ministry in various Islamic states, or its chief official.
Audience in the Diwan-i-Khas granted to the French ambassador, the vicomte d'Andrezel by Ottoman Sultan Ahmed III, 10 October 1724, in a contemporary painting by Jean-Baptiste van Mour.
The winter Diwan of a Mughal Nawab (painting from 1812)
Vizier
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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.
Portrait of Amir Kabir, Vazir of Naser al-Din Shah Qajar (Qajar dynasty)
Ivory chess vizier, Italy, 12th century