What is the relationship between Phantom of Opera and Roi de Lahore?

The Phantom of the Opera and Roi de Lahore are two very different operas, written by different composers and set in different time periods and locations. The Phantom of the Opera, composed by Andrew Lloyd Webber, is set in 19th-century Paris and tells the story of a mysterious masked figure who haunts a famous opera house. Roi de Lahore, composed by Jules Massenet, is set in ancient India and tells the story of a young woman who is torn between her love for a Buddhist monk and her duty to marry the king of Lahore.

The only relationship between the two operas is that they are both operas and both very popular with audiences around the world.