Question: Who is the spouse of the star of The Mistress of Shenstone?

full_context: Document 1: The Unchastened Woman: The Unchastened Woman is a 1925 American silent drama film starring vamp Theda Bara, directed by James Young, the former husband of Clara Kimball Young, and released by start-up studio Chadwick Pictures. The film is based on a 1915 Broadway play, "The Unchastened Woman", which starred Emily Stevens.
Document 2: Jack Standing: The son of stage actor Herbert Standing and brother of Wyndham Standing (1880–1963), who also was a famous actor in the early days of film, Jack Standing first appeared in Broadway musicals such as "The Belle of New York" and "Florodora" before he went to the Biograph Company in 1909. Because he was a handsome young man, he was quickly offered many roles and signed a contract with Sigmund Lubin in 1911. Like many others from the silent film, Standing was asked to play quite everything from passionate lovers to villains or old men. In 1915, he told the "Moving Picture World" magazine, "Spare me from being a one-type actor!" He appeared in more than fifty films. An incomplete print of 1915 Mary Pickford vehicle "Fanchon the Cricket", in which Standing co-starred, has recently been found. The teenage Fred and Adele Astaire allegedly made their screen debuts in this film. Standing's greatest success was the 1916 film "Hell's Hinges", where he played the weak-willed brother of Clara Williams.
Document 3: The Romance of a Movie Star: The Romance of a Movie Star is a 1920 British silent romance film directed by Richard Garrick and starring Violet Hopson, Stewart Rome and Gregory Scott. It is based on the novel "The World's Best Girl" by Coralie Stanton. A film star risks her reputation to help out a friend.
Document 4: The Woman on the Index: The Woman on the Index is a lost 1919 American silent drama film directed by Hobart Henley and starring Pauline Frederick and her then husband playwright Willard Mack. It was Frederick's first film at Goldwyn Pictures after coming over from Paramount. It is based on a 1918 Broadway play, "The Woman on the Index", that starred Julia Dean.
Document 5: The Mistress of Shenstone: The Mistress of Shenstone is a 1921 silent film romance directed by Henry King and starring Pauline Frederick and Roy Stewart based upon the novel by Florence L. Barclay.
Document 6: Love in the Hills: Love in the Hills is a 1911 American short silent drama film directed by D. W. Griffith and starring Blanche Sweet.
Document 7: The Pride of the Clan: The Pride of the Clan is a 1917 American silent romantic drama film directed by Maurice Tourneur, and starring Mary Pickford and Matt Moore.
Document 8: Mistress Pamela: Mistress Pamela is a 1974 British sex comedy drama film directed by Jim O'Connolly and starring Ann Michelle, Dudley Foster, Anna Quayle and Anthony Sharp. It was loosely based on the 1740 novel "Pamela, or Virtue Rewarded" by Samuel Richardson.
Document 9: Mistress Nell: Mistress Nell is a 1915 American silent historical adventure film starring Mary Pickford. It is yet another story about Nell Gwyn taken from a Broadway play "Mistress Nell" that was very successful for stage actress Henrietta Crosman from 1900 to 1902. This production was produced by Adolph Zukor's production company Famous Players Film Company and released through Paramount Pictures. The film is extant.
Document 10: Woman's Place: Woman's Place is a 1921 American romantic comedy film directed by Victor Fleming. It stars Constance Talmadge and Kenneth Harlan. It was produced by Talmadge's brother-in-law, Joseph Schenck and distributed through Associated First National, later First National Pictures.
Document 11: Woman (1918 film): Woman is a 1918 American silent film directed by Maurice Tourneur, an allegorical film showcasing the story of women through points in time. Popular in its day, the film was distributed in the State's Rights plan as opposed to a major distributor like Paramount or Universal. This film has been preserved in private collections and in major venues like the Museum of Modern Art and reportedly the Gosfilmofond Archive in Russia.
Document 12: A Woman of Pleasure: A Woman of Pleasure is a lost 1919 American silent drama film directed by Wallace Worsley and starring Blanche Sweet. It was distributed by Pathé Exchange in the United States.
Document 13: The Branded Woman: The Branded Woman is a 1920 American silent drama film released by First National Pictures. It stars Norma Talmadge who also produced the film along with her husband Joseph Schenck through their production company, Norma Talmadge Productions. The film is based on a 1917 Broadway play "Branded", by Oliver D. Bailey and was adapted for the screen by Anita Loos and Albert Parker who also directed.
Document 14: The Red Widow: The Red Widow is a lost 1916 silent comedy film produced by Famous Players-Lasky, distributed by Paramount Pictures. The film was based on a 1911 Broadway musical play "The Red Widow" by Channing Pollock and Rennold Wolf and starring comedian Raymond Hitchcock. John Barrymore stars in this film in the Hitchcock part of Cicero Butts. Hitchcock's wife, Flora Zabelle, is the leading lady in this film.
Document 15: The Notorious Lady: The Notorious Lady is a surviving 1927 silent film feature length adventure produced by Sam E. Rork and distributed by First National Pictures. It was directed by veteran actor/director King Baggot and starred Barbara Bedford and Lewis Stone.
ground_truth: Willard Mack
sub_queries: Who was the star of The Mistress of Shenstone? Answer: Pauline Frederick
Pauline Frederick >> spouse Answer: Willard Mack