St. Ursula's Day is celebrated on October 21st in honor of St. Ursula, a legendary Christian martyr. According to tradition, she was a British princess who, along with 11,000 companions, was killed by Huns in Cologne, Germany, for refusing to marry a pagan prince. The day is marked by various religious observances, including special masses and prayers in her honor. St. Ursula is often depicted with a lamp and arrows, symbolizing her faith and martyrdom. Many communities also celebrate with local festivals, highlighting her significance in Christian history and devotion.