Alexandre Dumas 
Conspirators 

The Conspirators (original French title: Le chevalier d’Harmental) is a novel written by Alexandre Dumas and Auguste Maquet, published in 1843. Dumas reworked a preliminary version by Maquet; this was the beginning of their collaboration which was to produce eighteen novels and many plays.[1] The dramatisation of the novel – in five acts, a prologue and ten tableaux – was first performed on 16 July 1849 at the Theatre-Historique in Paris.[2][3] It was adapted into an opera Le chevalier d’Harmental by Andre Messager with a libretto by Paul Ferrier, which was first performed on 5 May 1896. The novel is set in 1718, and its subject is a conspiracy against the regency of Philippe d’Orleans, who led France during the infancy of Louis XV. Dumas and Maquet’s later novel Une fille du regent features some of the same characters. (Excerpt from Wikipedia)