in 1787 and 1792 respectively. Two other operas of little success and long-term importance were composed in 1789, and one great popular success La cifra (The Cipher). As Salieri's political position became insecure he retired as director of the Italian opera in 1792. He continued to write new operas per imperial contract until 1804 when he voluntarily withdrew from the stage. Of his late works for the stage only two works gained wide popular esteem during his life, Palmira, Regina di Persia (Palmira, queen of Persia) 1795 and (Caesar on Pharmacusa), both drawing on the heroic and exotic success established with Axur. His late opera based on William Shakespeare's The Merry Wives of Windsor, Falstaff ossia Le tre burle (Falstaff, or the three tricks) (1799) has found a wider audience in modern times than its original reception promised. His last opera was a German-language Singspiel (The negroes), a melodrama set in colonial Virginia with a text by Georg Friedrich Treitschke (the author of the libretto for Beethoven's Fidelio); it was performed in 1804 and was a complete failure. Life after opera (1804–1825) When Salieri retired from the stage, he recognized that artistic styles had changed and he felt that he no longer had the creative capacity to adapt or the emotional desire to continue. Also as Salieri aged, he moved slowly away from his more liberal political stances as he saw the enlightened reform of Joseph II's reign, and the hoped-for reforms of the French revolution, replaced with more radical revolutionary ideas. As the political situation threatened and eventually overwhelmed Austria, which was repeatedly crushed by French political forces, Salieri's first and most important biographer Ignaz von Mosel described the emotional effect that this political, social, and cultural upheaval had on the composer. Mosel noted that these radical changes, especially the invasion and defeat of Austria, and the occupation of Vienna intertwined with the personal losses that struck Salieri in the same period and led to his withdrawal from operatic work. Related to this Mosel quotes the aged composer concerning the radical changes in musical taste that were underway in the age of Beethoven, "From that period [circa 1800] I realized that musical taste was gradually changing in a manner completely contrary to that of my own times. Eccentricity and confusion of genres replaced reasoned and masterful simplicity." As his teaching and work with the imperial chapel continued, his duties