St. Bartholomew's Day refers to August 24, a day commemorating the martyrdom of Saint Bartholomew, one of the twelve apostles of Jesus. In Christian tradition, this day is observed with various religious ceremonies and is significant in many cultures, particularly in Europe. The most notable historical event associated with St. Bartholomew's Day is the St. Bartholomew's Day Massacre in 1572, when thousands of Huguenots, or French Protestants, were killed in Paris during the French Wars of Religion. This tragic event marked a turning point in the conflict between Catholics and Protestants in France.