Pop Quiz on Saint John Nepomucene

For all you smart Catholics out there, who know all about the saints, we’re having a pop quiz today. Why is it appropriate, on this feast of Saint John Nepomucene, that the YouTube video of Bedřich Smetana’s Die Moldau (from his the symphonic cycle Má vlast) would be posted below?

It would be cheating to read the Saint of the Day entry on him until you’ve made your answer in the comments below.

Note: Saint John Nepomucene is not to be confused with Saint John Nepomucene Neumann, the fourth bishop of Philadelphia, who was named after him.

Come to think of it, why is it particularly appropriate that the fourth bishop of Philadelphia was named after today’s saint?