End of Dynasty
Jean de Brosse (died 1502), grandson of Nicole de Blois the aforementioned, asserted their claim to the duchy when the last male duke Francis II died. Previous Montfortine rulers of Brittany had however by confiscations and exilings much weakened the Penthièvre family's resources in the duchy and Anne succeeded her father in the administration which wanted to protect Brittany's position to external predators.
Anne died in 1514, leaving her inheritance to her elder daughter Claude of France (died 1524), who was proclaimed Reigning Duchess, but it was under the tactical dominion of Anne's widower king Louis (Claude's father, died 1515), and afterwards Claude's husband king Francis. The Montfort family continued only in female line, as nominally and titularly first Claude and then her sons François, Dauphin of France and after him the future Henry II of France were proclaimed Dukes of Brittany.
Claude's widower Francis I of France incorporated the duchy into the Kingdom of France in 1532 through the Edict of Union between Brittany and France, which was registered with the Estates of Brittany.
Read more about this topic: Montfort Of Brittany