TSAREVICH

'Tsarevich' (Russian: Царевич) is a Slavic term for the Tsar's son. Under the Pauline house law, the term was discontinued. The tsar's eldest son (and Heir Apparent), came to be called Tsesarevich. His younger brothers were called Grand Dukes.
Alexei Nikolaevna, son of Nicholas II, was the last adult member of Russian royalty to be called Tsarevich
In olden times, the term was also applied to descendants of the khans (tsars) of Kazan, Kasimov, and Siberia after these khanates had been annexed by Russia. See Tsarevichs of Siberia, for example.

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