| description = performed June 2010
The '''Piano Sonata No. 14''' in C minor, K. 457, by Wolfgang Amadeus Mozart was composed and completed in 1784, with the official date of completion recorded as October 14, 1784 in Mozart's private catalogue of works.Wolf, 2007 It was published in December of 1785 together with the Fantasy in C minor, K. 475, as Opus 11 by the publishing firm Artaria, Mozart's main Viennese publisher.
The title page bore a dedication to Thérèse von Trattner, who was one of Mozart's pupils in Vienna. Her husband was an important publisher as well as Mozart's former landlord. Eventually, the Trattners would become godparents to four of Mozart's children.
The sonata was composed during the approximately 10-year period of Mozart's life as a freelance artist in Vienna after he removed himself from the patronage of the Archbishop of Salzburg in 1781. It is one of the earliest of only six sonatas composed during the Vienna years, and was probably written either as a teaching tool or for personal use.Mercado, 1992 Sonatas during this time were generally written for the domestic sphere - as opposed to a symphony or concerto, they were designed to convey ideas in a small, intimate setting.
A typical performance takes about 18 minutes.