Career
Leopold von Sonnleithner was a grandson of the composer Christoph Sonnleithner and son of the lawyer Ignaz von Sonnleithner. Leopold married Hamburg native Louise Augusta Gosmar (11 August 1803 – 7 June 1850) on 6 May 1828. Sonnleithner received his doctorate of law on 4 May 1819 in Vienna.
Schubert dedicated his musical setting of Grillparzer"s Serenade "Hesitantly Quiet" (D921) to Sonnleithner"s wife Louise.
And it was Sonnleithner who handled Carl Czerny"s will. Sonnleithner was buried at a cemetery in the Viennese district of Margareten in 1873.