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.
Philippe Musard Philippe Musard (8 November 1792 – 31 March 1859) was a French composer who was crucial to the development and popularity of the promenade concert. One of the most famous personalities of Europe during the 1830s and 1840s, his concerts in Paris and London were riotous (in several senses of the word) successes. Best known for his "galop" and "quadrille" pieces, he composed many of these numbers himself, usually borrowing famous themes of other composers. Musard plays an important role in the development of light classical music, the faculty of publicity in music, and in the role of the conductor as a musical celebrity. He has been largely forgotten subsequent to his retirement in the early 1850s.