Louise de la Vallière by Alexandre Dumas is the third volume of the Vicomte de Bragelonne series, concluding the D'Artagnan Romances. Set in the early reign of Louis XIV, it centers on the tender romance between the young king and the gentle Louise de la Vallière, beloved of Raoul de Bragelonne, son of Athos. Amid court intrigue at Versailles and Fontainebleau, the Musketeers face divided loyalties: D'Artagnan serves the king faithfully, while Aramis pursues a secret scheme involving a mysterious prisoner. When Louis abandons Louise for Madame de Montespan, Raoul departs for war in despair, weaving a poignant tale of love, honor, and betrayal.