Final answer:
The St. Bartholomew's Day Massacre was an event that took place in 1572 in Paris, France, during a period of religious conflict between Protestants and Catholics. Catholic mobs attacked and killed around 3,000 Protestants.
Step-by-step explanation:
The event described in the question is known as the St. Bartholomew's Day Massacre. It occurred in 1572 in Paris, France, during a period of religious conflict between Protestants and Catholics. In this massacre, Catholic mobs attacked and killed around 3,000 Protestants.