Question: Who's the husband of the writer of The Unknown?
Context: Empress Xin (辛皇后) or Princess Xin (辛王后, personal name unknown) was the wife of the Chinese state Former Liang's ruler Zhang Zuo.  Whether her title was empress or princess is unclear, because historical sources differ on the subject. " Jin Shu", which reported that her husband claimed the title of emperor when he declared a total break from Jin Dynasty (265-420) in 354, reported that he created her empress. " Zizhi Tongjian", which reported that her husband claimed the title of prince, reported that he created her princess.  Nothing else is known about her.  In 355, when her husband was killed in a coup and replaced by his nephew Zhang Xuanjing, his two sons (whether by her or not) were also executed, but nothing was mentioned about her fate. "Nothing in the Rules" is a contemporary fantasy story by American writer L. Sprague de Camp.  It was first published in the magazine "Unknown" for July, 1939.  It first appeared in book form in the anthology "From Unknown Worlds" (Street & Smith, 1948).  It later appeared in the collections "The Reluctant Shaman and Other Fantastic Tales" (Pyramid, 1970), "The Best of L. Sprague de Camp" (Doubleday, 1978), and "Aristotle and the Gun and Other Stories" (Five Star, 2002), as well as the anthologies "The Fantasy Hall of Fame" (Arbor House, 1983), "The Science Fictional Olympics" (Signet, 1984), "Mermaids! " (Ace Books, 1986), "Unknown" (Baen, 1988) and "The Fantasy Hall of Fame" (HarperPrism, 1998) (a different anthology from the 1983 book of the same title).  The story has been translated into French, German, and Italian. Frank Fay (born Francis Anthony Donner; November 17, 1891 – September 25, 1961) was an American vaudeville comedian and film and stage actor.  For a time a well known and influential star, he later fell into obscurity, in part because of his abrasive personality and fascist political views.  He is considered an important pioneer in stand up comedy.  He played the role of "Elwood P. Dowd" in the Broadway play "Harvey" by the American playwright Mary Coyle Chase.  He is best known as actress Barbara Stanwyck's first husband.  Their troubled marriage is thought by some to be the basis of the 1937 film "A Star is Born", in which the previously unknown wife shoots to stardom while her husband's career goes into sharp decline.  Fay was notorious for his bigotry and alcoholism, and according to the American Vaudeville Museum, "even when sober, he was dismissive and unpleasant, and he was disliked by most of his contemporaries". Empress Zhang (birth and death dates unknown), personal name unknown, was an empress of the state of Shu Han in the Three Kingdoms period.  She was a daughter of the Shu general Zhang Fei and a younger sister of Empress Jing'ai.  In 237, she became an Imperial Consort (貴人) of the Shu emperor Liu Shan.  In the first lunar month of 238, she became the empress, succeeding her elder sister, who died in the previous year.  In 264, after Shu was conquered by the rival state of Cao Wei, Empress Zhang accompanied her husband to the Wei capital Luoyang. Violet Emily Wegner, (1887-1960), was the daughter of an Extradition Department detective of Scotland Yard, William T. Wegner, and Arabella Eliza née Darby, who resided in a district of London called Tulse Hill.  Violet made a career in the music halls from the age of 15.  She became known as the "Idol of Berlin".  In 1912, Violet married her first husband, Sergio Francesco Enrico Maria Brunetta d'Usseaux (born 3 March 1885, Torino, Italy), in London.  Sergio's parents were Comte Eugenio Brunetta d'Usseaux and the Russian Countess Zeiffart.  Eugenio was Secretary General of the Olympic Committee that administered the 1908 London Olympics.  Eugenio died in 1919 in mysterious circumstances.  The fate of his son, and Violet's husband, is also unknown although it is suggested he may have been the son Eugenio was trying to reach following the October Revolution.  Whilst traveling in Italy during 1918, Violet met the youngest son and royal prince, Pierre Petrović-Njegoš, of the exiled King Nicholas I of Montenegro.  After some delay, it is said, at the behest of Violet's mother who advised them to await the award of monies claimed by the prince from the new Yugoslav government for the confiscation of his family's property in Montenegro, Violet married Prince Pierre (Peter) of Montenegro in Paris in the April of 1924.  Violet then became HRH Princess Pierre of Montenegro and thus sister-in-law to Queen Elena of Italy as well as a host of other European princes and kings via her husband's siblings. Richard Denning (March 27, 1914 – October 11, 1998) was an American actor best known for starring in science fiction films of the 1950s, including "Unknown Island" (1948), "Creature from the Black Lagoon" (1954), "Target Earth" (1954), "Day the World Ended" (1955), "Creature with the Atom Brain" (1955), and "The Black Scorpion" (1957).  Denning also appeared in the film "An Affair to Remember" (1957) with Cary Grant and on radio with Lucille Ball, as George and Liz Cooper, in "My Favorite Husband" (1948–1951), the forerunner of television's "I Love Lucy".  His character's name on CBS Radio's "My Favorite Husband" was changed from George Cugat to George Cooper later in 1948.  A television version of "My Favorite Husband" (1953-1955) was broadcast on CBS for two seasons during the tenure of "I Love Lucy". The Unknown is the 14th book in the Animorphs series, written by K.A. Applegate.  It is narrated by Cassie.  The front cover quote is, "Never underestimate the power of a morph...".  All books after "The Unknown" were dedicated to Applegate's son, Jake, as well as her husband and co-writer, Michael. Sir Francis Tanfield (born 1565, date of death unknown) was Proprietary Governor of the South Falkland colony (in modern Newfoundland) of Henry Cary, 1st Viscount Falkland, his cousin's husband.  Tanfield was to establish a colony at Renews and left England in 1623 with an unknown number of colonists.  The settlers were harassed by migratory fishermen who used the harbour.  He was the leader of the colony of "South Falkland" from 1623 to 1625.  The colony was still in existence in 1626 when it was visited by Sir Richard Whitbourne but the settlers likely returned to England shortly afterwards.  By 1630, Tanfield was back in England about to embark to Ireland on a mission for King Charles I. Animorphs is a science fantasy series of young adult books written by Katherine Applegate and her husband Michael Grant, writing together under the name K. A. Applegate, and published by Scholastic.  It is told in first person, with all six main characters taking turns narrating the books through their own perspectives.  Horror, war, dehumanization, sanity, morality, innocence, leadership, freedom and growing up are the core themes of the series. Rakt Sambandh (Hindi: रक्त सम्बन्ध, English: "Blood Relations") is a multi-star cast thriller show.  "Rakt Sambandh" aired on Monday 19 July 2010 on NDTV Imagine.  A visually impaired young woman with the help of four supportive elder sisters and a loving father has overcome her difficulties to lead a normal life.  But life takes a different turn, when she finds her father dead under mysterious circumstances on her wedding day.  With the affection showered by her husband Yuvraj and his family, Sandhya begins to smile again… but not for too long.  Unknown to her, Sandhya's new family have a deep, dark secret… How will she react when she discovers the truth about her husband?
Answer: Michael Grant