The resurgence in French keep design began after the defeat of the royal armies at the battles of Crécy in 1346 and Poitiers in 1356, which caused high levels of social unrest across the remaining French territories. Charles V of France attempted to restore French royal authority and prestige through the construction of a new range of castles. The Château de Vincennes, where a new keep was completed under Charles by 1380, was the first example of these "palace fortresses". The keep at Vincennes was highly innovative: six stories high, with a "chemin de ronde" running around the machicolated battlements; the luxuriously appointed building was protected by an "enceinte" wall that formed a "fortified envelope" around the keep. The Vincennes keep was copied elsewhere across France, particularly as the French kings reconquered territories from the English, encouraging a style that emphasised very tall keeps with prominent machicolations. No allowance for the emerging new gunpowder weapons was made in these keeps, although later in the century gunports were slowly being added, as for example by Charles VI to his keep at Saint-Malo.