This simple relief of Mithras killing the bull without his companions Cautes and Cautopates was found in the so-called Mithraeum of the Esquilino, Rome.
This monument bears an inscription by a certain Lucius Aelius Hylas, in which he associates Sol Invictus with Jupiter.
TNMM642 – CIMRM 2006, 2007
Io(vi) S(oli) invi(cto) / deo genitori / r(upe) n(ato).
L. Aeli(us) Hylas (vicesimarius) l(ibertus) pr(o) sa(lute) et Horientis (sic) fil(ii) sui et Apuleia(e) eius signum numinis cum absidata / ex v…
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.