Original: The title of Archduke (feminine: Archduchess) (German: Erzherzog, feminine form: Erzherzogin) denotes a noble rank above Duke and below King, used primarily by princes of the Houses of Habsburg and Habsburg-Lorraine.
Simplified: Archduke (Erzherzog) is a title distinct from Grand Duke (Großherzog or Großfürst) that is used in some other German royal houses and still in sovereign Luxemburg.