ARCHDUKE
archduke
(noun) a sovereign prince of the former ruling house of Austria
Source: WordNet® 3.1
Etymology
Noun
archduke (plural archdukes)
(history) The son or male-line grandson of an emperor of the Austro-Hungarian Empire.
(history) The ruler of an archduchy, in particular the Archduchy of Austria.
Source: Wiktionary
Arch`duke", n. Etym: [Pref. arch- + duke.]
Definition: A prince of the imperial family of Austria.
Note: Formerly this title was assumed by the rulers of Lorraine,
Brabant, Austria, etc. It is now appropriated to the descendants of
the imperial family of Austria through the make line, all such male
descendants being styled archduke, and all such female descendants
archduchesses.
Source: Webster’s Unabridged Dictionary 1913 Edition