The frescoes of the Santa Priscilla catacombs in Rome call our knowledge of the past into question and challenge the teachings of the Church. Amanda Ruggeri investigates. When archaeologists in Rome at the end of the 19th Century began to excavate the Catacombs of Santa Priscilla, they hoped to find treasure: intricately carved monuments and vibrant frescoes of the type found in other ancient, underground cemeteries. Instead, they found devastation.