French Trag�die Opera in four acts, Iphig�nie en Tauride (Iphigenia in Tauris) by Christoph Willibald von Gluck (1714-1787). The first performance was held in Paris, Academie Royale de Musique, May 18, 1779. Libretto was written by Nicolas-Francois Guillard, based on the play by Euripides.