Archduke

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Imperial, royal, noble, gentry and chivalric ranks in Europe
Emperor, Empress dowager Tsar, Tsarina High king, High queen
King consort dowager Queen regnant consort dowager mother Grand duke, Grand duchess Archduke, Archduchess
Prince consort Princess consort Duke, Duchess Crown prince, Crown princess Herzog Jarl Prince-elector, Princess-elector
Marquess, Marchioness Margrave, Margravine Marcher lord Count palatine Voivode
Count, Countess Earl Ealdorman
Viscount, Viscountess Castellan Burgrave, Burgravine Landgrave Advocatus Vidame Starosta
Baron, Baroness Thane Lendmann Primor Boyar
Ritter Baronet, Baronetess Fidalgo Nobile
Knight, Chevalier Imperial Knight Druzhinnik
Esquire Gentleman, Gentlewoman Ministerialis Lord of the Manor
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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 roughly equal to King, Prince-Archbishop, and Grand prince, but above that of a Grand Duke, Sovereign Prince, and Duke.^[1]

The territory ruled by an archduke or archduchess was called an archduchy. All remaining archduchies ceased to exist in 1918. The current head of the House of Habsburg is Karl Habsburg.