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As the Duchess of Brittany, Anne held the highest-ranking position of power and authority within the duchy. She assumed this role upon the death of her father, Duke Francis II, in 1488, making her the sovereign ruler of Brittany. During her reign, Anne navigated complex political alliances and maintained Brittany's independence until her marriage to King Charles VIII of France in 1491, resulting in the unification of Brittany and France.