In 1374, Henry went to the court of his uncle, King Charles V of France. In 1380, Henry was knighted at the coronation of his cousin, Charles VI. He would fight in the 1383 Flanders campaign and in the 1388 Guelders campaign. He then returned to Bar and governed it on behalf of his father, who was often immobilised by attacks of gout.
In November 1384, Henry himself married Marie de Coucy, Countess of Soissons (1366–1405),[2] daughter of Enguerrand VII Count of Soissons & Sire de Coucy, by his first wife Princess Isabella of England, eldest daughter of King Edward III. Marie became Dame de Coucy et de Oisy following her father's death in 1397. Henry had two children by Marie:
In 1396, Henry negotiated the neutrality of Gian Galeazzo Visconti, Duke of Milan, in dealings with the French protectorate in the republic of Gênes. He then fought on the side of the Duke of Nevers in the crusade against the Ottoman Empire,[3] being captured at the end of the Battle of Nicopolis on 25 September 1396. He was taken prisoner[4] and later ransomed,[5] but died at the crusader's camp in Treviso after contracting the plague in Venice on his return trip.[6]
Savage, Henry L. (1939). "Enguerrand de Coucy VII and the Campaign of Nicopolis". Speculum. 14 (4 Oct). The University of Chicago Press. doi:10.2307/2849531. JSTOR2849531. S2CID162344126.
Setton, Kenneth Meyer (1976). The Papacy and the Levant, 1204-1571: The Thirteenth and Fourteenth Centuries. Vol. I. The American Philosophical Society.