Question: Where did Marie I De Coucy, Countess Of Soissons's husband die?

Knowledge 1: Marie I de Coucy, Countess of Soissons
Marie I de Coucy (April 1366 – after 3 March 1405) was Dame de Coucy and d'Oisy, and Countess of Soissons from 1397.She succeeded to the title of suo jure Countess of Soissons, on 18 February 1397, upon the death of her father, Enguerrand VII de Coucy.In addition to her titles, she also owned numerous estates in North-Eastern France.She was the wife of Henry of Bar, and the granddaughter of King Edward III of England and Philippa of Hainault. [SEP] Knowledge 2: Henry of Bar
Henry of Bar (c. 1362 – October 1397, in Treviso, Italy) was lord of Marle and the Marquis de Pont-à-Mousson.He was the eldest son of Robert I of Bar and Marie of Valois.Very early in his life, he was betrothed to Isabella of Lorraine, daughter of John I, Duke of Lorraine.In 1374 he went to the court of his uncle King Charles V of France and was knighted at the coronation of king Charles VI of France, fighting in the Flanders campaign in 1383 and the Guelders campaign in 1388.He then returned to Bar and governed it on behalf of his father, who was often immobilised by attacks of gout.His betrothal was broken off and his fiancée instead married Enguerrand VII, Lord of Coucy (†1397).In November 1384 Henry himself married Marie de Coucy, Countess of Soissons (1366–1405), 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, being captured at the end of the Battle of Nicopolis on 25 September 1396.He was taken prisoner and later ransomed, but died at the crusader's camp in Treviso after contracting the plague in Venice on his return trip.
Knowledge 1: Henry of Bar
Henry of Bar (c. 1362 – October 1397, in Treviso, Italy) was lord of Marle and the Marquis de Pont-à-Mousson.He was the eldest son of Robert I of Bar and Marie of Valois.Very early in his life, he was betrothed to Isabella of Lorraine, daughter of John I, Duke of Lorraine.In 1374 he went to the court of his uncle King Charles V of France and was knighted at the coronation of king Charles VI of France, fighting in the Flanders campaign in 1383 and the Guelders campaign in 1388.He then returned to Bar and governed it on behalf of his father, who was often immobilised by attacks of gout.His betrothal was broken off and his fiancée instead married Enguerrand VII, Lord of Coucy (†1397).In November 1384 Henry himself married Marie de Coucy, Countess of Soissons (1366–1405), 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, being captured at the end of the Battle of Nicopolis on 25 September 1396.He was taken prisoner and later ransomed, but died at the crusader's camp in Treviso after contracting the plague in Venice on his return trip. [SEP] Knowledge 2: John I, Count of Soissons
John I (d. after 1115), son of William Busac, Count of Eu and Soissons, and Adelaide, Countess of Soissons.Count of Soissons.John became Count of Soissons after the death of his brother Renaud II in 1099.John was involved with the Abbey of St. Jean des Vignes.John married Aveline de Pierrefonds, daughter of Nivelon II, Seigneur de Pierrefonds.John and Aveline had one child:Upon the death of John, his son Renaud became the last of the Norman Counts of Soissons.
Knowledge 1: Marie I de Coucy, Countess of Soissons
Marie I de Coucy (April 1366 – after 3 March 1405) was Dame de Coucy and d'Oisy, and Countess of Soissons from 1397.She succeeded to the title of suo jure Countess of Soissons, on 18 February 1397, upon the death of her father, Enguerrand VII de Coucy.In addition to her titles, she also owned numerous estates in North-Eastern France.She was the wife of Henry of Bar, and the granddaughter of King Edward III of England and Philippa of Hainault. [SEP] Knowledge 2: John I, Count of Soissons
John I (d. after 1115), son of William Busac, Count of Eu and Soissons, and Adelaide, Countess of Soissons.Count of Soissons.John became Count of Soissons after the death of his brother Renaud II in 1099.John was involved with the Abbey of St. Jean des Vignes.John married Aveline de Pierrefonds, daughter of Nivelon II, Seigneur de Pierrefonds.John and Aveline had one child:Upon the death of John, his son Renaud became the last of the Norman Counts of Soissons.

Answer: Treviso