The Austrian Empire ("Kaisertum Österreich") from 1804 to 1867 consisted of the Habsburg lands as a whole, leaving each land its special definition as kingdom (e.g., Bohemia, Hungary), archduchy (Lower and Upper Austria), duchy (e.g., Carniola) or princely county (e.g., Tyrol), however the Kingdom of Hungary—as Regnum Independens—was administered by its own institutions separately from the rest of the empire. "Kaisertum" might literally be translated as "emperordom" on analogy with "kingdom" or "emperor-ship"; the term denotes specifically "the territory ruled by an emperor". Austria proper (as opposed to the complex of Habsburg lands as a whole) had been an archduchy since the 15th century, and most of the other territories of the Empire had their own institutions and territorial history, although there were some attempts at centralization, especially between 1848 and 1859.