Severus, pre-
fect of the Tungrians, erects this;
The work being superintended by Victor Sevrus (or Severus), the princeps.[[127]]
PETRIANA.
The Notitia places the ‘Ala Petriana,’ under a prefect, at Petriana. Although two inscriptions belonging to this place mention the second cohort of the Tungri, none have been found here which name the Ala Petriana. It is possible that this cohort may have been a part of the Ala Petriana, but until this point be settled, or some further light thrown upon the subject, the occurrence of Cambeck-fort|CAMBECK-FORT.| next in order to Amboglanna, must be regarded as the best evidence of its being the Petriana of the Notitia.
WRITTEN-ROCK OF GELT.
Before crossing the Cambeck-water it may be well to remind the reader, that the river Gelt, on whose rocky banks the Roman quarrymen have left lettered memorials of their toil, is about four miles to the south of this place. With the view of clearly displaying the inscription, which has frequently been inaccurately engraved, the lithograph opposite to page 81, has been drawn to a scale which precludes the possibility of shewing the height of the cliff. The adjoining wood-cut partly supplies this deficiency; it exhibits another inscription, not of a very intelligible.|PIGEON-CRAG.| character, on the Pigeon-crag, which is a little higher up the water, and shews the general character of the scenery on this beautiful stream.
The distance of these quarries on the Gelt, from the line of the Barrier, renders it very questionable whether large supplies were derived from them for the Wall. Hodgson remarks—
The quarry at Helbeck-scar (the Written-rock) might serve for the largest stones for part of the Murus, and the stations at Brampton-old-church, and Walton-castlesteads; for the general purpose of the Murus, stone, however, could be got in places much nearer than Helbeck-scar.