In late 16th-century France, Catholics and Protestant Huguenots were at war. Seemingly seeking peace, the French dowager queen, Catherine de Medici summons Henry to her court to have him marry her daughter, uniting the two warring factions. However, the Catholics slaughter the Protestant wedding guests in what became known as the St. Bartholomew's Day massacre and Henry-now married-must use all his guile to both stay alive and maneuver for the throne.