The Duchess of Portsmouth was a title held by Louise de Kérouaille, a French noblewoman who became a prominent figure in the court of King Charles II of England. Born in 1649, she was known for her beauty and charm, which captivated the king. In 1673, she was granted the title of Duchess of Portsmouth, reflecting her close relationship with Charles II. Louise de Kérouaille played a significant role in the political landscape of her time, often acting as a mediator between England and France. Her influence extended to various court affairs, and she was involved in several controversies, particularly regarding her loyalty and the king's favoritism towards her.