Question: What screenwriter was Bernardo Bertolucci married to when he directed Liv Tyler's first leading film role?

Context articles: Bernardo Bertolucci
Gabriella Cristiani
Tragedy of a Ridiculous Man
Little Buddha
The Last Emperor
Stealing Beauty
Giuseppe Bertolucci
1900 (film)
The Conformist (film)
On the Wrong Track

Bernardo Bertolucci (] ; born 16 March 1940) is an Italian director and screenwriter, whose films include "The Conformist", "Last Tango in Paris", "1900", "The Last Emperor", "The Sheltering Sky", "Stealing Beauty" and "The Dreamers".
 In recognition of his work, he was presented with the inaugural Honorary Palme d'Or Award at the opening ceremony of the 2011 Cannes Film Festival.
 Since 1979, he has been married to screenwriter Clare Peploe.
Gabriella Cristiani (born 1949) is an Italian film editor with about twenty feature film credits.
 She has had a notable collaboration with director Bernardo Bertolucci.
 Early in her career she assisted editor Franco Arcalli on two of Bertolucci's films, "Last Tango in Paris" (1972) and "1900" (1976).
 Arcalli was the "supervising editor" on a 1977 film, "Berlinguer, I Love You", that was one of Cristiani's first feature editing credits; the film was directed by Giuseppe Bertolucci - Bernardo's brother.
 Arcalli was to have edited Bernardo Bertolucci's next film, "La Luna" (1979), but he died during production; Cristiani, who was assisting, then took over as editor.
Tragedy of a Ridiculous Man (Italian: La tragedia di un uomo ridicolo ) is a 1981 Italian film directed by Bernardo Bertolucci.
 It stars Anouk Aimée and Ugo Tognazzi, who was awarded the Best Male Actor Award at the 1981 Cannes Film Festival for his performance.
 In his review, Vincent Canby describes the film as, "Bernardo Bertolucci's very good, cerebrally tantalizing new film, "Tragedy of a Ridiculous Man," the story of what may or may not be a terrorist kidnapping of the sort that has been making Italian headlines with increasing frequency in recent years."
Little Buddha is a 1993 Italian-French-British drama film directed by Bernardo Bertolucci and starring Chris Isaak, Bridget Fonda and Keanu Reeves as Prince Siddhartha (the Buddha before his enlightenment).
 It is produced by Bertolucci's usual collaborator, Jeremy Thomas.
The Last Emperor (Italian: "L'ultimo imperatore" ) is a 1987 British-Italian epic biographical film about the life of Puyi, the last Emperor of China, whose autobiography was the basis for the screenplay written by Mark Peploe and Bernardo Bertolucci.
 Independently produced by Jeremy Thomas, it was directed by Bertolucci and released in 1987 by Columbia Pictures.
 Puyi's life is depicted from his ascent to the throne as a small boy to his imprisonment and political rehabilitation by the Communist Party of China.
Stealing Beauty (French: "Beauté volée" ; Italian: "Io ballo da sola" ) is a 1996 drama film directed by Bernardo Bertolucci and starring Liv Tyler, Joseph Fiennes, Jeremy Irons, Sinéad Cusack, and Rachel Weisz.
 Written by Bertolucci and Susan Minot, the film is about an American teenage girl who travels to a lush Tuscan villa near Siena to stay with family friends of her poet mother, who recently died.
 The film was an international co-production between France, Italy, the United Kingdom, and the United States, and was actress Liv Tyler's first leading film role.
Giuseppe Bertolucci (27 February 1947 – 16 June 2012) was an Italian film director and screenwriter.
 He directed 26 films between 1972 and 2012.
 He was the younger brother of Bernardo Bertolucci.
1900 (Italian: "Novecento" , "Twentieth Century") is a 1976 Italian epic historical drama film directed by Bernardo Bertolucci, starring Robert De Niro, Gérard Depardieu, Dominique Sanda, Sterling Hayden, Alida Valli, Romolo Valli, Stefania Sandrelli, Donald Sutherland, and Burt Lancaster.
 Set in Bertolucci's ancestral region of Emilia, the film is a praise of communism and chronicles the lives of two men during the political turmoils that took place in Italy in the first half of the 20th century.
 The film was screened at the 1976 Cannes Film Festival, but was not entered into the main competition.
The Conformist (Italian: "Il conformista" ) is a 1970 political drama film directed by Bernardo Bertolucci.
 The screenplay was written by Bertolucci based on the 1951 novel "The Conformist" by Alberto Moravia.
 The film stars Jean-Louis Trintignant and Stefania Sandrelli, and features Gastone Moschin, Enzo Tarascio, Fosco Giachetti, José Quaglio, Dominique Sanda and Pierre Clémenti.
 The film was a co-production of Italian, French, and West German film companies.
On the Wrong Track is a 1983 Hong Kong action drama film directed by Clarence Fok and starring Andy Lau, Jeem Yim, Elliot Ngok, Prudence Liew and introducing the then newcomer actress Winnie Chin.
 The film is Lau's third film role and also his first leading film role.