Then the first performance of Tristan and Isolde took place at the
Hof-und Nationaltheater in Munich.
Richard Wagner - own picture - picture & statue in Nymphenburg Castle
Tristan & Isolde is a three act drama written by Richard Wagner based on the
romance drama work made by Gottfried von Strassburg (13th. century).
This opera had a strong influence to the Western European Classical Composers,
such as inter alia Richard Strauss.
Tristan and Isolde - Source picture: Wikipedia
On next link you can listen and see to the theme of the Tristan and Isolde opera.