The Benedictine Plaque is one of the oldest and most honored medals used by Christians. Due to the belief in its power against evil it 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, while it was used by the Roman Pope Leo IX. The reverse side of the medal carries the Vade retro Satana (Be gone, satan!) formula, which has been used by Christians to ward off evil since the 15th century.
While only certain priests are allowed to perform exorcisms, everyone can use the Saint Benedict Medal, holy water, the crucifix and other prayers to ward off evil. The Saint Benedict Medal on both sides of the Celtic Cross is believed to be a powerful tool against evil influences.