Romanticism was a cultural movement that developed in the late 18th and early 19th centuries in Europe. It was a reaction against the rationalism and materialism of the Enlightenment, emphasizing emotion, individualism, and the beauty of nature. Romantic artists, writers, and musicians sought to express the sublime, the mysterious, and the supernatural in their works. Key themes of Romanticism include freedom, nostalgia, the power of the imagination, and the heroism of the individual. Romanticism had a profound influence on literature, art, music, and philosophy, and its legacy can still be seen in modern culture.