James Dalton Trumbo (December 9, 1905 – September 10, 1976) was an American screenwriter and novelist, who scripted films including "Roman Holiday", "Exodus", "Spartacus", and "Thirty Seconds Over Tokyo".
 One of the Hollywood Ten, he refused to testify before the House Un-American Activities Committee (HUAC) in 1947 during the committee's investigation of Communist influences in the motion picture industry.
 He was subsequently blacklisted by that industry.
 He continued working clandestinely, producing work under other authors' names.
 His uncredited work won two Academy Awards; the one for "Roman Holiday" (1953) was given to a front writer, and the one for "The Brave One" (1956) was awarded to a pseudonym.
 The public crediting of him as the writer of both "Exodus" and "Spartacus" in 1960 marked the end of the Hollywood Blacklist.
 His earlier achievements were eventually credited to him by the Writers Guild, 60 years after the fact.
Eclipse is Dalton Trumbo's first novel published in 1935.
 The novel is about a town and its people written in the social realist style.
 The town, which Trumbo calls "Shale City," was modeled on Grand Junction, Colorado, where Trumbo lived from 1908 until he left for the University of Colorado in 1924.
 Trumbo's daughter Nikola writes in a foreword to a new edition of Eclipse that the character John Abbott was a substitute for Trumbo's father and "was based on the real-life Grand Junction citizen W.J. Moyer, (who) was also destroyed (as his father had been) by the depression."
 The new edition, published by the Mesa County Public Library Foundation in 2005, includes a list that matches Grand Junction residents to characters in the book and acknowledges that the book's sometimes harsh portrayal of Grand Junction made it controversial in Trumbo's hometown.
Christopher Trumbo (September 25, 1940 – January 8, 2011) was an American television writer, screenwriter and playwright.
 Trumbo was considered an expert on the Hollywood blacklist during the McCarthy era.
 His father, screenwriter Dalton Trumbo, was blacklisted by Hollywood for nearly a decade for refusing to testify to Congress, as one of a group known as The Hollywood Ten.
Tender Comrade (1943) is a black-and-white film released by RKO Radio Pictures, showing women on the home front living communally while their husbands are away at war.
 The film starred Ginger Rogers, Robert Ryan, Ruth Hussey, and Kim Hunter and was directed by Edward Dmytryk.
 The film was later used by the HUAC as evidence of Dalton Trumbo spreading communist propaganda.
 Trumbo was subsequently blacklisted.
 The film's title comes from a line in Robert Louis Stevenson's poem "My Wife" first published in "Songs of Travel and Other Verses" (1896).
Peter Askin (Born 1940) is an actor, director, producer and screenwriter best known for directing the 2007 film "Trumbo", a documentary about the Oscar-winning Hollywood screenwriter Dalton Trumbo who was blacklisted for being a member of the Hollywood Ten.
 For the film, he worked closely with Trumbo's son, Christopher Trumbo.
The Queen's Fool by Philippa Gregory is a 2004 historical fiction novel.
 Set between 1548 and 1558, it is part of Philippa Gregory's Tudor series.
 The series includes "The Boleyn Inheritance".
 The novel chronicles the changing fortunes of Mary I of England and her half-sister Elizabeth through the eyes of the fictional Hannah Green, a Marrano girl escaping to England from Spain where her mother was burned at the stake for being Jewish.
 Hannah is discovered by Robert Dudley and John Dee and subsequently begged as a fool to Edward VI.
 She witnesses and becomes caught up the intrigues of the young king's court, and later those of his sisters.
 As Mary, Elizabeth, and Robert Dudley use Hannah to gather information on their rivals and further their own aims, the novel can plausibly present each side in the complex story.
 "The Queen's Fool" follows Hannah from ages fourteen to nineteen, and her coming-of-age is interspersed among the historical narrative (see Bildungsroman).
 The book reached # 29 on the "New York Times" Best Seller list and had sold 165,000 copies within three weeks of its release.
Philippa Gregory (born 9 January 1954) is an English historical novelist who has been publishing since 1987.
 The best known of her works is "The Other Boleyn Girl" (2001), which in 2002 won the Romantic Novel of the Year Award from the Romantic Novelists' Association and has been adapted into two separate films.
Trumbo is a 2015 American biographical drama film directed by Jay Roach and written by John McNamara.
 The film stars Bryan Cranston, Diane Lane, Helen Mirren, Louis C.K., Elle Fanning, John Goodman and Michael Stuhlbarg.
 The film follows the life of Hollywood screenwriter Dalton Trumbo and is based on the biography "Dalton Trumbo" by Bruce Alexander Cook.
Johnny Got His Gun is a 1971 American drama anti-war film written and directed by Dalton Trumbo and starring Timothy Bottoms, Kathy Fields, Marsha Hunt, Jason Robards, Donald Sutherland and Diane Varsi.
 It was based on the novel of the same name by Trumbo, and features an uncredited writing collaboration by Luis Buñuel.
 The film was released on DVD in the U.S on April 28, 2009 via Shout!
 Factory, with special features.
Trumbo is a 2007 American documentary film directed by Peter Askin, produced by Will Battersby, Tory Tunnell, and Alan Klingenstein, and written by Christopher Trumbo.
 It is based on the letters of Trumbo's father, Dalton Trumbo, an Oscar-winning screenwriter who was imprisoned and blacklisted as a member of the Hollywood Ten, ten screenwriters, directors and producers who refused to testify before the House Un-American Activities Committee (HUAC) in 1947 during the committee's investigation of Communist influences in the Hollywood film industry.

Question: Which novelist wrote more film scripts, James Dalton Trumbo or Philippa Gregory?
Answer: James Dalton Trumbo