Beethoven's Concerto No. 5 in E-flat Major. It was Beethoven's last piano concerto, written between 1809 and 1811. It is known as the "Emperor" Concerto because of its powerful themes and heroic note. The name "Emperor" dates from Beethoven's time but was not given by Beethoven himself, since the composer had little regard for emperors. A close friend of his, German composer Johann Baptist Cramer, is credited with giving the nickname.