The title of Archduke (feminine: Archduchess) (German: Erzherzog, feminine form: Erzherzogin) is a rank above Duke and under King. It is very rare. It was used only by princes of the House of Habsburg.
Ruler style[change | change source]
The English word is recorded only since 1530, derived from Middle Latin archidux, from arch(i)- (see arch- (adj.)) + dux 'duke' .