In 1354 Robert of Bar, who had married a French princess, was made Marquis of Pont-à-Mousson by the Emperor Charles IV and took the title of Duke of Bar.
On the death of his brother Edward III, Duke of Bar at the Battle of Agincourt in 1415, Louis inherited the dukedom and successfully defended his claim to it against that of his brother-in-law Adolphe, Duke of Juliers and of Berg, who felt that, as a clergyman, Louis was not suited to inherit the dukedom and its revenues.
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In 1354 Robert of Bar, who married a princess of France, was made Marquis of Pont-à-Mousson by the Emperor Charles IV and took the title of Duke of Bar.