the Libretto of  Amadis de Gaule was originaly set by an Italian-born French composer, instrumentalist, and dancer who spent most of his life working in whose court?
Amadis de Gaule (J.C. Bach) Amadis de Gaule, or Amadis des Gaules ("Amadis of Gaul"), is a French opera in three acts by the German composer Johann Christian Bach. The libretto is a revision by Alphonse de Vismes of "Amadis" by Philippe Quinault, originally set by Jean-Baptiste Lully in 1684, which in turn, was based on the knight-errantry romance "Amadis de Gaula" (1508). Bach's opera was first performed at the Académie Royale de Musique, Paris on 14 December 1779. It followed the contemporary French fashion for resetting libretti by Quinault ("Armide" by Gluck and "Roland" by Piccinni are other examples of this trend). The work was not a success with the Parisian public, mainly because it pleased neither the supporters of Gluck nor those of Piccinni, the two leading rival opera composers in France at the time. It was the last opera J. C. Bach composed.
Henri Bertini Henri Jérôme Bertini (28 October 1798 – 30 September 1876) was a French classical composer and pianist. He was born into a family of musicians and attracted the attention of François-Joseph Fétis when he toured Europe as a child prodigy. As an adult he was admired both as a soloist and as a chamber musician; it was said that he played with Johann Nepomuk Hummel's simplicity and elegance without sacrificing the brilliance of the instrument. As a composer he had an original style which was rich in musical ideas, attractive melodies, and effortless harmonies. In 1848 he retired from the musical scene and settled in the Dauphiné in south-east France.