You searched for: “archduke
A chief duke.

The assassination of Archduke Francis Ferdinand of Austria on June 28, 1914, precipitated World War I.

This entry is located in the following unit: arch- (page 1)
Word Entries at Word Info: “archduke
archduke (s) (noun), archdukes (pl)
1. The chief duke: formerly title of the rulers of Austrasia, Lorraine, Brabant, and Austria, being assumed by those of Austria in 1359; now titular dignity of sons of the Emperor of Austria.
2. Etymology: from Latin arch-, "chief" or "highest ranking" + dux, genitive of ducis, "leader, commander"; from ducere, "to lead".