This marble plaque was made by a Pater and priest Lucius Septimius Archelaus of Mithras for him, his wife and his freedmen and freedwomen.
TNMM453 – CIMRM 511
D(is) M(anibus) / L. Septimius Aug(ustorum trium) lib(ertus) Archelaus / pater et sacerdos invicti / Mithrae domus Augustanae / fecit sibi et Cosiae Primitivae / coniugi benemerenti libertis liberta/b…
The Mithraeum of the Seven Spheres is of great importance for the understanding of the cult, because of its black-and-white mosaics depicting the planets, the zodiac and related elements.
This small cippus to Zeus, Helios and Serapis includes Mithras as one of the main gods, although some authors argue that it could be the name of the donor.