St. Walburga was an English nun and abbess who lived during the 8th century. She is best known for her missionary work in Germany, where she helped spread Christianity. St. Walburga was the sister of St. Boniface, a prominent missionary, and she founded several monasteries, including the one in Heidenheim. Her feast day is celebrated on February 25th, and she is often depicted holding a lamp, symbolizing her role as a light in the darkness of paganism. St. Walburga is also associated with various legends, including the protection against witchcraft and diseases, making her a popular saint in Christianity.