High Quality Content by WIKIPEDIA articles! Kniaz , knyaz or knez is a Slavic title found in most Slavic languages, denoting a royal nobility rank. It is usually translated into English as either Prince or less commonly as Duke. In the Vatican, some Croatian knyazes were referred to as "Dux Croatorum". Today the term knez is still used as the most common translation of "prince" in Croatian and Serbian literature. Another translation is kraljevi ("little king" or "kingly"), such as Kraljevi Marko, though this term is used to refer to a prince or princess of royal birth, son or daughter of a king. Knez is nowadays a very common surname in some ex-Yugoslavian countries, mostly in Croatia, Montenegro, Serbia and Slovenia. The female form transliterated from Bulgarian, Ukrainian and Russian is knyaginya, kneginja in Slovene and Serbo-Croatian. In Russian, the daughter of a knyaz is knyazhna, in Ukrainian is kniazivna. The title is pronounced and written similarly in different European languages.