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• (n.) A German nobleman of a rank corresponding to that of an earl in England and of a count in France.
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http://thinkexist.com/dictionary/meaning/landgrave/

a title of nobility in Germany and Scandinavia, dating from the 12th century, when the kings of Germany attempted to strengthen their position in ...
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http://www.britannica.com/eb/a-z/l/12
Land'grave` noun [ German
landgraf ;
land land +
graf earl, count; confer Dutch
landgraaf , French
landgrave .] A German nobleman of a rank corresponding to that of an earl in England and of a count in France. » The title was first adopted by some German counts...
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http://www.encyclo.co.uk/webster/L/10

In Germany, originally, about the 12th century, landgrave was the title of district or provincial governor deputed by the emperor, and given them to distinguish them from the inferior counts under their jurisdiction. Later, landgrave was the title of three princes of the empire, whose territories - Thuringia, Lower and Higher Alsace - were called l...
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http://www.probertencyclopaedia.com/browse/CXL.HTM

[
n] - a count who had jurisdiction over a large territory in medieval Germany
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http://www.webdictionary.co.uk/definition.php?query=landgrave
noun a count who had jurisdiction over a large territory in medieval Germany
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https://www.encyclo.co.uk/local/20974
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