In the film, King Arthur, there are many similarities and differences when being compared to the novel. My main focus is on the many differences that change the relevance of the story.
Arthur's father is a Roman general from the Imperial Roman army and his mother is a Celtic woman. In the historical notes of the legend, Arthur's father is Uther Pendragon, a famous Romano-British commander and one of Britain's earlier kings, and his mother is Igraine, a beautiful young woman who was once the wife of Gorlois, the Duke of Cornwall and one of Uther's loyal subjects.
Arthur's knights are described differently in the film and the legend. In the film, Lancelot, Tristan, Bors and the other Knights of the Round Table are Sarmatian