CIMRM 876 - Inscription. High Rochester / Durham Chapter Library, Britain.

From R.G. Collingwood, The Roman inscriptions of Britain:

RIB 1272: ansate slab with extreme lower-right corner missing; 1730 at High Rochester; Durham Chapter Library; dated: AD 218-22?; see #1265; restored.
DEO INVICTO ET SOLI SOC SACRVM PRO SALVTE ET INCOLVMITATE IMP CAES M AVRELI ANTONINI PII FELIC AVG L CAECILIVS OPTATVS TRIB COH I VARDVL CVM CONSECRANEIS VOTVM DEO... A SOLO EXTRVCTVM...

From C.H. Moore, Oriental Cults in Britain, Harvard Studies in Classical Philology, Vol. 11 (1900), pp. 47-60, p.56:

Finally we find north of Hadrian's wall at High Rochester, the Roman Bremenium, the record of the building of a temple to Mithras by a tribune and his fellow worshippers: 1039, Deo invicto Soli soc(io) |sacrum. Pro salute |et incolumitate imp(eratoris) Caes(aris) | M. Aureli Antonini pii felic(is) | Aug(usti) L. Caecilius Optatus | tribunus) coh(ortis) I Vardul(lorum) cum con[sa] craneis votum l[i]be[n]s [s(olvit) aedem(que)] |a solo extrucx[it d(e) s(ua) p(ecunia)].
Bruce[1] has shown that the emperor here named is Elagabalus, hence the date is 219-222 A.D. The inscription therefore proves that even after the abandonment of the wall of Antoninus Pius by Septimius Severus ca. 207 A.D., the station at Bremenium was still occupied, as were Habitancium and the camp at Netherbys; but how long in the third century this garrison continued here cannot be determined. This inscription is the latest reference to the cohors I Vardullorum.
But the rare word consacranei requires notice. In literature it is found in Capitolinus, Gord. 14 = commilitones and Tertullian Apol. 16 of a fellow believer; it occurs in two inscriptions, CIL. XII, 5379, in a dedication to a Gallic divinity, consacran . Bovodates, and III, 2109, where the dedicator is described col(lega) et consacranius. The word clearly denotes the member of a religious association, and its use in our inscription proves that such an organization for the worship of Mithras existed among the members of this cohort.
[1] Bruce, The Roman Wall, 3rd ed. (1867), p.320.

In fact the reference to Bruce appears to be in error. But a detailed description of Bremenium may be found in the same volume, and this monument discussed, with image, on p.252-3:

A tablet, found at this station, but now in the library at Durham. contains the name of Caecilius Optatus. This slab, which is represented in the annexed woodcut, for the purpose of comparison, evidently belongs to the time of Elagabalus, an emperor who gloried in the title of priest of the sun. The altar, as well as the slab, may, therefore, with strong probability be ascribed to the same period. Elagabalus reigned from 219 to 222.
DEO INVICTO SOLI SOC[IO]
SACRVM PRO SALVTE ET
INCOLVMITATE IMP. CAES[ARIS]
M. AVRELI[I] ANTONINI PII FELIC[IS]
AVG[VSTI] L. CAECILIVS OPTATVS
TRIB. COH. I. VARDUL[LORVM] CVM CON[SE]-
CRANEIS VOTVM DEO [TEMPLVM]
A SOLO EXTRVCTVM . . . .
To the unconquered god the sun [his] companion
sacred - for the safety and
welfare of the Emperor Caesar
Marcus Aurelius Antoninus pious happy
august Lucius Caecilius Optatus
tribune of the first cohort of Varduli with his associates
this temple vowed to the god
and reared from the ground [dedicates.]

CIMRM entry

BREMENIUM
876
Tabula lapidea magna litteris bonis.
CIL VII 1039; MMM II No. 486.
Deo invicto Soli soc(io) / sacrum. Pro salute / et incolumitate imp(eratoris) Caes(aris) / M. Aureli Antonini pii felic(is) / aug(usti) L. Caecilius Optatus / trib(unus) coh(ortis) I Vardul(lorum) cum con[sa]/craneis votum l[i]be[n]s [s(olvit) aedemq(ue)] / a solo extrux[it d(e) s(ua) p(ecunia)].
Probabiliter M. Aurelium Antoninum hunc Elagabalum esse statuit Bruce. Between 219-222 A.D.
L. Caecilius Optatus: cf. CIL VII 1035 in which he occurs in an inscription dedicated to Minerva.
From consacranei it appears, that the inscription. is dedicated to Mithras (Cumont). "The latest treatment of this inscription by Richmond in Northumberland County History XV, 145, High Rochester No. 5, where he discusses the reading" (Wright).