Volsinii or Vulsinii, is the name of two ancient cities of Etruria, one situated on the shore of Lacus Volsiniensis, and the other on the Via Clodia, between Clusium and Forum Cassii.
The altar of the Mithraeum of San Clemente bears the Tauroctony on the front, Cautes and Cautopates on the right and left sides and a serpent on the back.
This high stele by a certain Acilius Pisonianus bears an inscription commemorating the restoration of a Mithraeum in Mediolanum, today's Milan.
TNMM650 – CIMRM 706
D(eo) S(oli) i(nvicto) M(ithrae) / P(ublius) Acil(ius) Piso/nianus pater / patratus qui / hoc speleum / vi{i} ignis ab/sumtum com/parata area a re-/publ(ica) Mediol(anensi) / pecunia sua / restituit.