In the year 809, a significant flood threatened the burial site of Saint Amandus, prompting the monks, led by Lotharius, to raise his sarcophagus to prevent water damage. Despite the floodwaters surrounding the tomb, the sacred body remained untainted, revealing a miraculous preservation that astonished the witnesses. This event is seen as a divine act, showcasing the holiness of Saint Amandus and affirming his sanctity. The monks' efforts culminated in a solemn mass, further honoring the revered pontiff and emphasizing the importance of recounting God's works.