St. Helen was the mother of Rome?s first Christian emperor, Constantine. St. Helen made a pilgrimage to the Holy Land and returned with many relics of the Passion, now housed in a chapel in the lower level of the church. Among these relics are the cross of the "Good Thief", nails from Christ?s Passion, a thorn from the Crown of Thorns, the "INRI" sign from Christ?s cross, pieces of the Cross, and the finger of St. Thomas, or "Doubting Thomas."

