Marius Pontmercy is a fictional character from Victor Hugo's novel Les Misérables. He is a young man who becomes involved in the political struggles of early 19th-century France. Marius is the son of a royalist officer but grows up to embrace republican ideals, leading him to join revolutionary movements. Marius is also known for his romantic feelings for Cosette, the daughter of Jean Valjean. His character represents the conflict between personal desires and social responsibilities, as he navigates love, friendship, and his commitment to the cause of justice during a turbulent time in French history.