Marble inscribed slab recording the dedication of a Mithraeum and an antrum to Mithras for the safety and victories of Septimius Severus and his family, found in Rome.
Franz Cumont kindly drew our attention on several ancient fragments, walled in the wall of the flight of steps in the house at the Via Boncompagni 101 (boarding- house Cosmopolita).
Lanciani, Storia Scavi, III, 200 gives another interesting note about a second Mithraeum, discovered in 1869 near the previous sanctuary in Muti's gardens.