Brett Ashley is a fictional character from the novel "The Sun Also Rises," written by Ernest Hemingway. She is an American expatriate living in Europe during the 1920s and is known for her beauty, charm, and independent spirit. Brett is often seen as a modern woman who defies traditional gender roles, engaging in relationships with multiple men throughout the story. In the novel, Brett's complex relationship with the protagonist, Jake Barnes, highlights themes of love, loss, and the impact of war. Her character embodies the struggles of the "Lost Generation," a term used to describe those disillusioned by the aftermath of World War I.