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. Brice's Day massacre there was significant loss of life, though evidence is lacking on any specific estimates. Among those thought to have been killed is Gunhilde, who may have been the sister of King Sweyn I of Denmark. Her husband Pallig Tokesen, the Danish Ealdorman of Devonshire, may also have died in the massacre or, according to a different version, played a part in provoking it by his defection to join raiders ravaging the south coast. The massacre in Oxford was justified by Æthelred in a royal charter of 1004 explaining the need to rebuild St Frideswide's Church (now Christ Church Cathedral): The