When was the oldest version of "Dangerous Liaisons" written?

Search: dangerous liaisons

Why: I'm watching the 1988 version with John Malkovich, Glenn Close, Michelle Pfeiffer, Keanu Reeves, and Uma Thurman.

Answer: The epistolary novel Les Liaisons Dangereuses by Pierre Ambroise Francois Choderlos de Laclos was first published in 4 volumes starting on March 23, 1782. It has since been adapted into:

• Les Liaisons Dangereuses (1959 French film starring Jeanne Moreau)
• Kiken na kankei (1978 Japanese film)
• Nebezpecne Znamosti (1980 Czechoslavakian TV movie)
• Les Liaisons Dangereuses (1980 French TV movie)
• Dangerous Liaisons (1988 American film - the one I'm watching)
• Les Liaisons Dangereuses (1988 English play)
• Valmont (1989 film by Milos Forman, starring Colin Firth and Annette Bening)
• Cruel Intentions (1999 film starring Ryan Phillippe, Sarah Michelle Gellar, Reese Witherspoon, and Selma Blair)
• Untold Scandal / Joseon Namnyeo Sangyeoljisa (2003 Korean film)
• Dangerous Liaisons (2005 adult film featuring RuPaul and Boy George)
  

Source: Wikipedia

The More You Know: Alternate titles for "Cruel Intentions" include:

• Erotika paihnidia (Greece)
• The Temptation More Beautiful Than a Love (South Korea)
• Sexe Intentions (France)