Archduke (feminine: Archduchess) (German: Erzherzog, feminine form: Erzherzogin) was the title borne from 1358 by the Habsburg rulers of the Archduchy of Austria and later, by all senior members of that dynasty. It denotes a rank within the former  Holy Roman Empire (962–1806), which was below that of Emperor and King and above that of Duke and Prince.