_Duchy of Luxembourg The Duchy of Luxemburg (Luxemburg; Luxembourg; Luxemburg; Lëtzebuerg) was a state of the Holy Roman Empire, the ancestral homeland of the noble House of Luxembourg. The House of Luxembourg, now Duke of Limburg, became one of the most important political forces in the 14th century, competing against the House of Habsburg for supremacy in Central Europe. They would be the heirs to the Přemyslid dynasty in the Kingdom of Bohemia, succeeding the Kingdom of Hungary and contributing four Holy Roman Emperors until their own line of male heirs came to an end and the House of Habsburg got the pieces that the two Houses had originally agreed upon in the Treaty of Brünn in 1364. In 1443, the duchy passed to Duke Philip the Good of Burgundy of the French House of Valois, and, in 1477, by marriage to Archduke Maximilian I of Austria of the House of Habsburg. The Seventeen Provinces of the former Burgundian Netherlands were formed into an integral union by Holy Roman Emperor Charles V in the Pragmatic Sanction of 1549. In 1795, French revolutionaries ended this situation. The first known reference to the territory was made by Julius Caesar in his Commentaries on the Gallic War. The historical region of Luxembourg belonged to the Roman province of Belgica Prima. After the invasion of the Germanic tribes from the East, Luxembourg became part of the Frankish Empire. By the 843 Treaty of Verdun, it became part of the Lotharingian province of Middle Francia. According to the Treaty of Ribemont in 880, it had finally fallen to East Francia. Modern historians explain the etymology of the word Luxembourg as coming from the word Letze, meaning fortification, which might have referred to either the remains of a Roman watchtower or a primitive refuge of the Early Middle Ages. County of Luxemburg By the 959 partition of Lotharingia, the Luxembourg region had passed to Duke Frederick I of Upper Lorraine of the House of Ardenne–Bar, a son of Count Palatine Wigeric of Lotharingia.