He divorced his czaritza that he might marry the foundling.    From Wordnik.com.  [We Can't Have Everything] Reference

The czaritza, mother of Dmitri, who had first incited the mob, was forced to take the veil.    From Wordnik.com.  [Historic Tales, Vol. 8 (of 15) The Romance of Reality] Reference

“I have come all the way from Siberia, czaritza, to see your day of honor, and now your Cossacks have killed me.”.    From Wordnik.com.  [The Secret Memoirs of the Courts of Europe]