Herzog is a German hereditary title held by one who rules a territorial duchy, exercises feudal authority over an estate called a duchy, or possesses a right by law or tradition, to be referred to by the ducal title. The word is usually translated by the English duke and the Latin Dux. Generally, a duke ranks below a king and above a count. Whether the title is deemed higher or lower than titles translated into English as "prince" (Fürst) has depended upon the language, country and era in which the titles co-existed.