Ceclava Czapska who claimed to be the Grand Duchess Marie married Prince Nicolas Dolgoruky in Romania. Nicolas was the son of General Alexander Dolgoruky. How did Nicolas get the title of Prince?
The Dolgorukys were one of the most famous noble families in Russia and there were Princes and Princesses by birth.
Alexander II. wife was Ekaterina Mikhailovna Dolgorukaya, which by the way means long (dolgo in sense of time, like I was waiting dolgo...I waited long), hand (ruka).
y/aya is a noble prefix like Princess of
XY (the last Empress was Aliks Gessen-Darmshtadtskaya by birth)