The popularly named "Tomb of the Julii" (Mausoleum "M") survives in the Vatican Necropolis beneath St. Peter's Basilica. The serendipitous discovery near the crypt has a vaulted ceiling bearing a mosaic depicting Helios (Roman Sol Invictus) with an aureole riding in his chariot, within a framing of rinceaux of vine leaves, which are not given their usual pagan Dionysiac reading in this context but are related to the True Vine imagery of Gospel of John 15.1. The mosaic is dated to the late 3rd century to early 4th century. Other mosaics in this tomb depicting Jonah and the whale, the good shepherd carrying a lamb (the kriophoros motif), and fishermen have encouraged its interpretation as a Christian tomb.
This tomb was first discovered in 1574 AD when workmen accidentally broke through the ceiling while conducting some floor alterations in the basilica. The inside was briefly explored and documented before the opening was sealed over once more.
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