Question: 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? 
Sentence (from "Amadis de Gaule (J.C. Bach)"): Bach's opera was first performed at the Académie Royale de Musique, Paris on 14 December 1779.
Relevant evidence: No