This remarkable Roman inscription, recovered from a pit or ritual shaft, has been translated as:
To the Divinities of the Emperors (and) to the god Mars Camulus. Tiberinius Celerianus, a citizen of the Bellovaci, moritix, of Londoners the first [….]
(RIB III, 3014: Tomlin & Hassall 2003, 364).

There is every chance that this inscription, dedicated to the Romano-Celtic God Mars Camulus, once adorned the northern temple. It adds identity to the temple complex; without it, the temples would have remained simple foundations. The first thing of note is the use of the word ‘londiniensium’ meaning people of London. This is the first stone inscription found with the name of the city, or in this case the inhabitants of the city, carved into it. A great deal more information is available from this piece however. The first fact concerning the date of the artefact comes from the first line where the two ‘G’s refer to more than one Emperor. This dates the inscription to after AD 161 when Marcus Aurelius adopted Lucius Verus as co-emperor. There were numerous occasions on which this arrangement was adopted during the later Empire and the style of lettering is regarded as diagnostic of the later second century. If this interpretation is correct, the commissioning of this inscription dated to the period of the establishment of the religious complex on the site.

The inscription also names the benefactor, Tiberianus Celerianus, and tells us that he defined himself as a citizen of the Bellovaci, a Gaulish tribe whose territory was centred on modern Beauvais. His Gaulish connections are further evinced by the use of the word moritix, this is a Gaulish word meaning sea-farer or sea traveller but where found in other inscriptions seemingly connected to trade. These details paint a picture of a trader or traveller from northern France whose home seems to have become London. He may have formed part of a wider community from Gallia Belgica that had developed in the city. His choice of god, Mars Camulus, was in keeping with the dual tradition of a Romano-Celtic temple. The Celtic god Camulus, twinned with the Roman god Mars, was a popular deity in the homeland of the Bellovaci but only one other inscription from Britain is dedicated to Mars-Camulus. The main use of Camulus in Roman Britain comes almost exclusively from the place-name Camulodunum, the fortress of Camulus, or Colchester as we know it today.

The inscription is now in the Museum of London.