The Saint Benedict Medal is a Catholic sacramental medal containing symbols and text related to the life of Saint Benedict of Nursia. The medal is one of the oldest and most honored medals used by Catholics and due to the belief in its power against evil is also known as the "devil-chasing medal". As early as the 11th century, it may have initially had the form of Saint Benedict's cross, and was used by pope Leo IX. The reverse side of the medal carries the Vade retro satana ("Step back, Satan") formula which has been used by Catholics to ward off evil since the 15th century. Sometimes carried as part of the rosary, it is also found individually. In widespread use after its formal approval by pope Benedict XIV in the 18th century, the medal is used by Catholics to ward off spiritual and physical dangers, especially those related to evil, poison, and temptation.