Archduke
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Archduke was the title born 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.
Bust of Archduke Leopold Wilhelm of Austria
The heir to the Austro-Hungarian throne, Archduke Franz Ferdinand (right) with his family. Ferdinand, along with his wife, was assassinated at Sarajevo in 1914, which sparked World War I
Prince
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A prince is a male ruler or a male member of a monarch's or former monarch's family. Prince is also a title of nobility, often hereditary, in some European states. The female equivalent is a princess. The English word derives, via the French word prince, from the Latin noun prīnceps, from primus (first) and caput (head), meaning "the first, foremost, the chief, most distinguished, noble ruler, prince".
José, Prince of Brazil, Duke of Braganza, died before he could ascend to the throne of Portugal.
Coat of arms of the princes Sanguszko-Lubartowicz (Poland).
Coat of arms of the princes Youssoupoff