Paris in the 16th century on September 5, 1557, thirty were from noble families. In 1561-62, the number of Protestants in Paris was estimated at between ten and fifteen thousand; in France as a whole, three million, or fifteen percent of the population. The Massacre of Saint-Bartholomew's Day on August 23–24, 1572 killed between two and three thousand Protestants; it was followed by a large-scale emigration of Protestants out of the city, primarily to Sedan, Montbeliard and Geneva. In 1598, with the Edict of Nantes, the Protestant were again able to open a church a Grigny, on the banks of the Seine outside the city.
St. Bartholomew's Day massacre response to the threatening atmosphere for Huguenots in these cities. In Rouen, where some hundreds were killed, the Huguenot community shrank from 16,500 to fewer than 3,000 mainly as a result of conversions and emigration to safer cities or countries. Some cities unaffected by the violence nevertheless witnessed a sharp decline in their Huguenot population. It has been claimed that the Huguenot community represented as much as 10% of the French population on the eve of the St. Bartholomew's Day massacre, declining to 7-8% by the end of the 16th century, and further after heavy persecution began once again during