Alphonse du Congé (or Ducongé) Dubreuil (19 June 1734 – 22 February 1801) was an 18th-century French poet and playwright. In 1777, he wrote an opera libretto on the theme of Iphigénie en Tauride, which he proposed to Christoph Willibald Gluck but the text was eventually set in music by Niccolò Piccinni. Source: Wikipedia (en)