The Russian Dynasties were a series of ruling families that held power in Russia from the 10th century until the 1917 Revolution. The most famous of these dynasties was the Romanovs, who ruled from 1613 to 1917. The term 'CZAR' is derived from the Latin word 'CAESAR' and was used to refer to the Russian rulers during this period. CZAR was the title given to the monarchs of the Russian Empire and was used until the fall of the monarchy in 1917.