Wolfgang Amadeus Mozart completed his Symphony No. 41 in C major, K. 551, on 10 August 1788. The longest and last symphony that he composed, it is regarded by many critics as among the greatest symphonies in classical music. The work is nicknamed the Jupiter Symphony, likely coined by the impresario Johann Peter Salomon.
The above text from the Wikipedia article "Symphony No. 41 (Mozart)" text is available under CC BY-SA 3.0.