Der Ring des Nibelungen
Wagner wanted to have the Ring cycle performed in a special opera house which would be built in the way he wanted.  He needed a lot of money for his ideas, and he was very lucky to find someone who adored his music and was happy to give him a lot of money.  This was King Ludwig II of Bavaria (sometimes called the “mad king of Bavaria” because he did become insane).  Wagner told the King that the Ring cycle would be performed in Munich which was the capital city of Bavaria.  Later, when it seemed impossible to build a new opera house there, Wagner broke his promise and built his opera house in Bayreuth instead.  The King did not seem to mind and still gave him lots of money for the project as well as a nice house to live in.  Das Rheingold was first performed in Munich in 1869 and Die Walküre in 1870.  The whole Ring cycle was first performed in 1876 in the new opera house called the Festspielhaus in Bayreuth.