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The popularly-named "Tomb of the Julii" (Mausoleum "M") survives in the necropolis beneath St. Peter's Basilica, the so-called "Vatican grotto". 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 fourth century A.D. 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.
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