Landgrave n. : A German nobleman of a rank corresponding to that of an earl in England and of a count in France.

Example:


Taxonomy
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Defination from the web:
Landgrave occasionally continued in use as the subsidiary title of such nobility as the Grand Duke of Saxe-Weimar, who functioned as the ... Landgravine refers to the wife of a Landgrave or one who exercises the office or holds the rank in her own right. ...