Boyar
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A boyar or bolyar was a member of the highest rank of the feudal nobility in many Eastern European states, including Bulgaria, Kievan Rus', Moldavia and Wallachia, Lithuania and among Baltic Germans. Comparable to Dukes/Grand Dukes, Boyars were second only to the ruling princes, grand princes or tsars from the 10th to the 17th centuries.
Russian boyars in the 16th–17th centuries
A mounted Russian boyar from the 17th century
Wallachian vornic Șerban Grădișteanu wearing a kalpak, an indication of his boyar rank
Duma
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A duma is a Russian assembly with advisory or legislative functions.
Building of the Moscow City Duma