 The diocese covered Champagne, the Duchy of Burgundy, and Franche-Comté, and the bishops obtained the right to coin money in the ninth century and to name the military governor of the city in 927.The Bishop of Langres was a duke and peer of France.The troubled 14th and 15th centuries caused the town to strengthen its defenses, which still give the old city its fortified character, and Langres entered a period of royal tutelage.