Which opera Die Entführung aus dem Serail or Thaïs was originally performed first ?
Die Entführung aus dem Serail:  The work premiered on 16 July 1782 at the Vienna Burgtheater, with the composer conducting. Thaïs (opera):  It was first performed at the Opéra Garnier in Paris on 16 March 1894, starring the American soprano Sibyl Sanderson, for whom Massenet had written the title role.
i don't know