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.
Louis Couperin Louis Couperin (c. 1626 – 29 August 1661) was a French Baroque composer and performer. He was born in Chaumes-en-Brie and moved to Paris in 1650–1651 with the help of Jacques Champion de Chambonnières. Couperin worked as organist of the Church of St. Gervais in Paris and as musician at the court. He quickly became one of the most prominent Parisian musicians, establishing himself as a harpsichordist, organist, and violist, but his career was cut short by his early death at the age of thirty-five.