The Evidence of the Catacombs: For the Doctrines and Organisation of the Primitive Church (1929) by Orazio Marucchi is an archaeological study examining early Christian burial sites in Rome. It provides evidence for the beliefs, artistic symbols, and structural organization of the church, validating the antiquity of Catholic doctrines, such as the veneration of saints and the Eucharist, directly from the 1st–4th century, The findings shed light on the hierarchical structure, the role of clergy, and the communal life of the primitive Roman Christian community, Orazio Marucchi.