John I (French: Jean sans Peur ; Dutch: Jan zonder Vrees; 28 May 1371 – 10 September 1419) was a scion of the French royal family who ruled the Burgundian State from 1404 until his assassination in 1419. He played a key role in French national affairs during the early 15th century, particularly in the struggles to rule the country for the mentally ill King Charles VI, his cousin, and the Hundred Years' War with England. A rash, ruthless and unscrupulous politician, John murdered the King's brother, the Duke of Orléans, in an attempt to gain control of the government, which led to the eruption of the Armagnac–Burgundian Civil War in France and in turn culminated in his own assassination in 1419. The involvement of Charles, the heir to the French throne, in his assassination prompted John's son and successor Philip to seek an alliance with the English, thereby bringing the Hundred Years' War to its final phase. John played an important role in the development of gunpowder artillery in European warfare, making extensive and successful use of it in his military campaigns. Source: Wikipedia (en)