On this day in Tudor history, 18th August 1572, the marriage of Henry III, King of Navarre (the future Henry IV of France), the leading Huguenot, and the Catholic Margaret of Valois took place at Notre Dame Cathedral in Paris. The aim of this marriage was to unite the Bourbon and Valois families, and also to bring peace between the Catholics and Huguenots in France. However, the awful St Bartholomew’s Day Massacre of the Huguenots took place just six days after the wedding.