
1) Opera based on play 2) Opera by Édouard Lalo
Found on
https://www.crosswordclues.com/clue/fiesque

Fiesque (The Genoese Conspiracy) is an opera by the French composer Édouard Lalo. The libretto, by Charles Beauquier, is based on Schiller`s 1784 play, Die Verschwörung des Fiesco zu Genua, an account of the conspiracy in 1547 led by Fiesque against the ruling Doria family. It had its first staged performance at the Nationaltheater, Mannheim on....
Found on
http://en.wikipedia.org/wiki/Fiesque
No exact match found.