La localización de una comunidad mitraísta en San Juan de la Isla posee un notable interés, debido a la débil popularidad de este culto oriental entre las poblaciones de Hispania.
This marble slab, found in the Mithraeum of San Clemente, bears an inscription by a certain Aelius Sabinus for the health of the Emperor Antoninus Pius and his sons.
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 cylindrical marble altar was dedicated by the same Pater Proficentius as the slab, both monuments found in the Mithraeum beneath the Basilica of San Lorenzo.
TNMM439 – CIMRM 422
Aebutius Restituti/anus qui et Proficen/tius antistes dei / Solis invicti Mithrae/ aram / d(onum) d(edit)