Franz Schubert's Piano Sonata in C major D. 840, nicknamed Reliquie upon its first publication in 1861 in the mistaken belief that it had been Schubert's last work, was written in April 1825, whilst the composer was also working on the A minor sonata, D. 845 in tandem. Schubert abandoned the sonata, and only the first two movements of the sonata were fully completed, with the trio section of the third movement also written in full. The minuet section of the third movement is incomplete and contains unusual harmonic changes, which suggests it was there Schubert had become disillusioned and abandoned the movement and later the sonata. The final fourth movement is also incomplete, ending abruptly after 272 bars.