Louis I, Duke of Bar

Louis I of Bar (between 1370 and 1375 – 26 June 1430) was a French bishop of the 15th century and the de jure Duke of Bar from 1415 to 1430, ruling from the 1420s alongside his grand-nephew René of Anjou.

He was a son of Robert I of Bar and his wife Marie Valois, (daughter of John II of France). As the couple's fifth son, he was destined for a career in the church. He was Bishop of Poitiers from 1391 to 1395 (also being made a cardinal in 1391) before becoming Bishop of Langres (1397–1413), and then Bishop of Châlons-sur-Marne (1413–30). At the same time, he acted as bishop-administrator of Verdun (1419–23 and 1424–30).

He played an important role in French politics after the assassination of the Duke of Orleans in 1407. In 1409, he attended the Council of Pisa with Guy of Roye, Archbishop of Reims, and Peter of Ailly, Bishop of Cambrai. At Volti, near Gênes, a quarrel between the marshals of the town and the Archbishop of Reims degenerated into a riot, with the archbishop being killed and Louis missing-presumed dead. The cardinals, arriving at Pisa, pronounced the decline of popes Benedict XIII of Avignon and Gregory XII of Rome, and elected Pope Alexander V, putting an end to the Great Western Schism.

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