Caius Cas(sius?) Fla(vianus?) was a Roman citizen and centurion who belonged to the XXth legion stationed in the fort of Invetesk from the 140's until his departure in 165. He dedicated two altars in the Mithraeum set up near the fort, one to the god Sol and the other with several motives referring to the cults of Apollo and, more particularly, to those of Apollo Grannus, which were widely attested in the Rhine provinces.
This second altar discovered to date near Inveresk includes several elements unusual in Mithraic worship.
Daeo (sic) / invic(to) My(thrae) / C. Cas(sius ?) / Fla(vianus ?).
Au dieu invicible Mythra, Caius Cas(sius ?) / Fla(vianus ?).
The altar of Sol from Inveresk, Scotland, was pierced, probably to illuminate part of the temple with a particular effect.
Soli C(aius) Cas(sius ?) Fla(vianus ?) >
À Sol, Caius Cas(sius ?) Fla(vianus ?), centurion.