The term 'Royal Russian' refers to the ruling family of Russia from the 16th century until the 1917 Revolution. The TSAR was the title of the monarch, and the Czarevitch was the title of the heir apparent. The TSAR was the absolute ruler of Russia and had complete control over the government and the people. The Czarevitch was the designated successor to the throne and was expected to take over the role of TSAR upon the death of the current TSAR.