Tsarevich

A Tsarevich (Russian: Царе́вич) was a title used in Tsarist Russia for a son of a Tsar (emperor). It is generally translated as "Crown Prince," though this is not always strictly accurate. While often applied to the heir apparent, the title did not necessarily guarantee succession.

Prior to the formal establishment of the Russian Empire, the title was used more broadly to refer to any male member of the ruling dynasty, including sons of Tsars and other relatives. Over time, and particularly following the reforms of Peter the Great, its usage became more formalized.

The title specifically indicated a dynastic relationship to the ruling Tsar. The most famous example is likely Tsarevich Alexei Nikolaevich, the youngest child and only son of Tsar Nicholas II, who was heir apparent to the throne at the time of the Russian Revolution.

A female equivalent for a Tsar's daughter was Tsarevna.