Kniaz’ or knyaz is a word found in some Slavic languages, denoting a nobility rank. It is usually translated into English as either Prince or Duke, although the correspondence isn't exact. The title is pronounced and written similarly in different Eastern European languages. In West Slavic languages, such as Polish and Sorbian, the word has later come to denote "lord", and in Czech, Polish and Slovak also came to mean "priest" (kněz, ksiądz, kňaz) as well as "duke"… (More on Kniaz)