Basil Merteuil is a fictional character from the novel Les Liaisons Dangereuses, written by Pierre Choderlos de Laclos in 1782. He is portrayed as a cunning and manipulative aristocrat who engages in a game of seduction and betrayal. Basil is known for his intelligence and charm, using these traits to influence others for his own amusement. In the story, Basil collaborates with Madame de Merteuil, his former lover, to orchestrate complex schemes that involve various characters. His actions highlight themes of morality, power, and the consequences of manipulation within the context of the French aristocracy.