St. Helen is a significant historical figure known for her role as the mother of the Roman Emperor Constantine the Great. She is often credited with promoting Christianity within the Roman Empire during the early 4th century. St. Helen is particularly famous for her pilgrimage to the Holy Land, where she is said to have discovered the true cross of Jesus Christ. In addition to her religious contributions, St. Helen is venerated as a saint in various Christian traditions, including Catholicism and Orthodoxy. Her feast day is celebrated on May 21, and she is often depicted in art holding a cross, symbolizing her connection to the Christian faith.