Paris in the 16th century Wars of Religion (1562-1598). Paris was the stronghold of the Catholic League. On the night of August 23–24, 1572, while many prominent Protestants from all over France were in Paris on the occasion of the marriage of Henri of Navarre—the future Henry IV—to Margaret of Valois, sister of Charles IX, the royal council decided to assassinate the leaders of the Protestants. The targeted killings quickly turned into a general slaughter of Protestants by Catholic mobs, known as St. Bartholomew's Day massacre, and continued through August and September, spreading from Paris to the rest of the country. About three thousand Protestants
St. Bartholomew's Day massacre more steadfastly" (Dethou). The tension that had been building since the Peace of St. Germain now exploded in a wave of popular violence. The common people began to hunt Protestants throughout the city, including women and children. Chains were used to block streets so that Protestants could not escape from their houses. The bodies of the dead were collected in carts and thrown into the Seine. The massacre in Paris lasted three days despite the king's attempts to stop it. Holt concludes that "while the general massacre might have been prevented, there is no evidence that it was intended by