that point. Their support for each nation became very important during the 14th century because the English kings had started to claim the French throne. The Breton War of Succession, a local episode of the Hundred Years' War, saw the House of Blois, backed by the French, fighting with the House of Montfort, backed by the English. The Montforts won in 1364 and enjoyed a period of total independence until the end of the Hundred Years' War, because France was weakened and stopped sending royal envoys to the Court of Brittany. English diplomatic failures led to the Breton cavalry commanders Arthur, Comte de Richemont (later to become Arthur III, Duke of Brittany) and his nephew Peter II, Duke of Brittany playing key roles on the French side during the deciding stages of the war (including the battles of Patay, Formigny and Castillon and the Treaty of Arras). Brittany importantly lost the Mad War against France in 1488, mostly because of its internal divisions that were exacerbated by the corruption at the court of Francis II, Duke of Brittany. Indeed, some rebel Breton lords were fighting on the French side. Union with the French Crown and modern period As a result of the Mad War, the Duke Francis II could not have his daughter Anne married without the king of France's consent. Nonetheless, she married the Holy Roman Emperor in 1490, leading to a crisis with France. Charles VIII of France besieged Rennes and had the marriage cancelled. He eventually married Anne of Brittany. After he died childless, the duchess had to marry his heir and cousin Louis XII. Anne unsuccessfully tried to preserve Breton independence, but she died in 1514, and the union between the two crowns was formally carried out by Francis I in 1532. He granted several privileges to Brittany, such as exemption from the gabelle, a tax on salt that was very unpopular in France. Under the Ancien Régime, Brittany and France were governed as separate countries but under the same crown, so Breton aristocrats in the French royal court were classed as Princes étrangers (foreign princes). From the 15th to the 18th century, Brittany reached an economic golden age. The region was located on the seaways near Spain, England and the Netherlands and it greatly benefited from the creation of a French colonial empire. Local seaports like Brest and Saint-Brieuc quickly expanded, and Lorient, first spelled