The story of Dorian Grey is about a young man who sells his soul to remain young and beautiful while a portrait of him ages and reflects his moral corruption.
In some ways it is. Grey Owl was a real figure, but there might be some elements that have been embellished or fictionalized for the sake of the narrative.
To some extent, it is. The story of Effie Grey takes inspiration from actual historical circumstances and figures, but it might have some fictionalized elements for dramatic effect.