Although the legal status of Symphorus is uncertain, it can be pointed out that he bears a Greco-Oriental sounding name, which is well attested among slaves and freedmen in Rome. It is therefore likely that he should be attached to one of these social categories.
Other brothers from Aquincum
This sculpture of Mithras killing the sacred bull bears an inscription that mentions the donors.
[Sy]mphorus et M(arcus).
Symphorus and Marcus.