アントン・シンドラー
Beethoven's early biographer Anton Schindler claimed that the "Triple Concerto" was written for Beethoven's royal pupil, the Archduke Rudolf of Austria. The Archduke, who became an accomplished pianist and composer under Beethoven's tutelage, was only in his mid-teens at this time, and it seems plausible that Beethoven's strategy was to create a showy but relatively easy piano part that would be backed up by two more mature and skilled soloists. However, there is no record of Rudolf's ever performing the work.