On August 24, 1572, France faced its most crucial event in history: the Massacre of St. Bartholomew’s Day. Originally planned by Catherine de Medici, France’s regent and mother of King Charles, to assassinate Gaspard II de Coligny, France’s admiral and a leader of the Huguenots (French Calvinist), who has been progressively gaining the king’s attention. Catherine, afraid of Coligny’s influence over her son then plots an attempt assassination with the Roman Catholic, House of Guise, to exterminate Coligny. However, their plan foundered and has angered many Huguenots leaders that were in Paris at the time of the incident due to the gathering of Margaret of France, and Henry of Navarre(Huguenot) marriage. Thus, in order to cover up her tracks, Catherine planned another assassination with the nobles to decimate the Huguenot leaders. Though the main purpose of this decimation was mainly to remove all the Huguenot leaders in Paris at time of the incident, the massacre turned into a horrific bloodshed to all the Huguenot citizens living in France. The carnage slowly spread from the capital, to surrounding cities despite royal order from the palace to immobilize the attacks. Within a short span of time, the bloodshed turned bloodbath has reached rural provinces such as Rouen, Lyon, Bourges, Orleans, and Bordeaux. An approximated 2,000 to 70,000 Huguenots have been killed within the week of terror.The shocking news sent all the Protestant countries in Europe into turmoil. Whilst Spain’s King Phillip II, and Pope Gregory XII were delighted by such turn of events. As a result, the massacre has caused even further tension between Catholics and Protestants, and has been marked as the beginning of the War of Three Henrys and the continuity of the French War of Religion. The Huguenots then also agreed to disintegrate the Calvinistic principle that Huguenot followers must be under the rule of royal authority, and also put forth a new code that rebellion is acceptable under certain circumstances.