<P> Fidelio ( originally titled Leonore , oder Der Triumph der ehelichen Liebe ; English : Leonore , or The Triumph of Marital Love ) , Op. 72 , is Ludwig van Beethoven 's only opera . The German libretto was originally prepared by Joseph Sonnleithner from the French of Jean - Nicolas Bouilly , with the work premiering at Vienna 's Theater an der Wien on 20 November 1805 . The following year , Stephan von Breuning ( de ) helped shorten the work from three acts to two . After further work on the libretto by Georg Friedrich Treitschke , a final version was performed at the Kärntnertortheater on 23 May 1814 . By convention , both of the first two versions are referred to as Leonore . </P>
<P> Fidelio ( originally titled Leonore , oder Der Triumph der ehelichen Liebe ; English : Leonore , or The Triumph of Marital Love ) , Op. 72 , is Ludwig van Beethoven 's only opera . The German libretto was originally prepared by Joseph Sonnleithner from the French of Jean - Nicolas Bouilly , with the work premiering at Vienna 's Theater an der Wien on 20 November 1805 . The following year , Stephan von Breuning ( de ) helped shorten the work from three acts to two . After further work on the libretto by Georg Friedrich Treitschke , a final version was performed at the Kärntnertortheater on 23 May 1814 . By convention , both of the first two versions are referred to as Leonore . </P>
what is the name of beethoven 's only opera
what is the name of beethoven 's only opera
Fidelio
Fidelio