Tsarevna of Russia

Tsarevna (Царевна) was the daughter of a Tsar of Russia before the 18th century. The name is meant as a daughter of a Tsar, or as a wife of a Tsarevich.

All of them were unmarried, and grew old in convents or in the Terem Palace, with the exception of the daughters of Ivan V. Notably, Ivan V's daughter Catherine married duke Karl Leopold of Mecklenburg-Schwerin.

...
Wikipedia