Ludwig van Beethoven's Piano Sonata No. 4, in E♭ major, Op. 7, sometimes nicknamed the Grand Sonata, was written in November 1796 and dedicated to his student Babette, the Countess Keglević. The sonata was composed during Beethoven's visit to the Keglevich Palace. Beethoven named it Great Sonata, because it was published alone, which was unusual for the time.

The House of Keglević or Keglevich is a Croatian noble family originally from Northern Dalmatia, whose members were prominent public citizens and military officers. As experienced warriors, they actively participated in the Croatian–Ottoman and Ottoman–Hungarian wars, as well were patrons of the arts and holders of the rights of patronage over churches and parishes.