Joseph Freiherr von Sonnenfels was an Austrian and German jurist and novelist. He was among the leaders of the Illuminati movement in Austria, and a close friend and patron of Mozart. He is also the dedicatee of Ludwig van Beethoven's Piano Sonata No. 15, Op. 28, which was published in 1801.
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Address Rathauspark, Wien 1010, Austria
Coordinates 48°12'38.695" N 16°21'33.585" E