Archduke
/ˌɑːrtʃˈduːk/
Definition 1 of 1
Pro Tip 1/3Historical Significance
Archdukes were important in European history, especially in wars and alliances. 
Reading about the archduke can help you understand European history.
Pro Tip 2/3Austrian Royalty
Archduke was specific to the Austrian royal family, which doesn't exist anymore. 
The title of archduke became obsolete with the fall of the Austro-Hungarian Empire.
Pro Tip 3/3High Rank
An archduke was ranked higher than a duke, reflecting nobility status. 
He was not just a duke but an archduke, which meant greater prestige.