47 Ronin is a 2013 American 3D fantasy action film directed by Carl Rinsch. Written by Chris Morgan and Hossein Amini from a story by Morgan and Walter Hamada, the film is a work of Chūshingura ("The Treasury of Loyal Retainers") serving as a fictionalized account of the forty-seven rōnin, a real-life group of masterless samurai under daimyō Asano Naganori in 18th-century Japan who avenged Naganori's death by confronting his rival Kira Yoshinaka. Starring Keanu Reeves and Hiroyuki Sanada, the film was produced by H2F Entertainment, Mid Atlantic Films, Moving Picture Company and Stuber Productions, and was released theatrically by Universal Pictures on December 25, 2013 in the United States.