On this day in 1572, Queen Margaret of Valois and Henry of Navarre got married in Paris. The interdenominational marriage — Marguerite was Catholic, and Henry was a Huguenot — should have helped bridge the gap between Protestants and Catholics in France. It did not. On today's "A Classical Day in the Life", we explore the St. Bartholomew's Day Massacre and the opera it inspired Giacomo Meyerbeer to write.