father Francis of Guise during the siege of Orléans in 1563. During the peace settlement, a marriage was arranged between Charles' sister Margaret of Valois and Henry of Navarre, the future King Henry IV, who was at that time heir to the throne of Navarre and one of the leading Huguenots. Many Huguenot nobles, including Admiral de Coligny, thronged into Paris for the wedding, which was set for 18 August 1572. On 22 August, a failed attempt on Coligny's life put the city in a state of apprehension, as both visiting Huguenots and Parisian Catholics feared an attack by the other side. In this situation, in the early morning of 24 August 1572, the Duke of Guise moved to avenge his father and murdered Coligny in his lodgings. As Coligny's body was thrown into the street, Parisians mutilated the body. The mob action then erupted into the St. Bartholomew's Day massacre, a systematic slaughter of Huguenots that was to last five days. Henry of Navarre managed to avoid death by pledging to convert to Catholicism. Over the next few weeks, the disorder spread to more cities across France. In all, up to 10,000 Huguenots were killed in Paris and the provinces. Though the massacres weakened Huguenot power, they also reignited war, which only ceased after the Edict of Boulogne in 1573 granted Huguenots amnesty and limited religious freedom. However, the year 1574 saw a failed Huguenot coup at Saint-Germain and successful Huguenot uprisings in Normandy, Poitou and the Rhône valley, setting the stage for another round of war. Decline and death In the aftermath of the massacre, the king's fragile mental and physical constitution weakened drastically. His moods swung from boasting about the extremity of the massacre to exclamations that the screams of the murdered Huguenots kept ringing in his ears. Frantically, he blamed alternately himself – "What blood shed! What murders!", he cried to his nurse. "What evil counsel I have followed! O my God, forgive me... I am lost! I am lost!" – or his mother – "Who but you is the cause of all of this? God's blood, you are the cause of it all!" Catherine responded by declaring she had a lunatic for a son. Charles' physical condition, tending towards tuberculosis, deteriorated to the point where, by spring of 1574, his hoarse coughing turned bloody and his hemorrhages grew more violent. Charles IX died at the