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Gentleman's Magazine 1860 part 1 p.347 
  
[Banks]burn, near Lanercost, was discovered, which also  
mentions the Ala Petriana. The inscription may be read:- 
  
  
I[VNIVS] BRVTVS  
DEC[VRIO] AL[AE] PET[RIANAE].  
  
'Junius Brutus, a decurion (commander of ten men) of the  
Petriana cavalry.'  
Lastly, we have in the Notitia list, after the  
mention of the Tribune of the first AElian Cohort of Dacians 
at Amboglanna, the following entry:- 
  
 
Praefectus Alae Petrianae Petrianis. 
  
From this circumstance it has been inferred that Walton  
House, the station next west from Amboglanna, is the  
Petriana of the Notitia. 
  
Unfortunately we have met with no stony record of Ala  
Petriana at Walton House, though we have three of the Second 
Cohort of the Tungri, and one of the Fourth Cohort of the  
Gauls. 
  
By comparing the stones found at the various stations with  
the Notitia list, the names of the stations on the  
Wall between Wallsend and Birdoswald have been ascertained  
with certainty; westward of this, all is involved in  
comparative doubt. Had this stone been found at Walton  
House, it would have gone far to confirm the reasonings of  
antiquaries that this was Petriana. In all probablity this  
ala had not then taken up its position upon the Wall. 
The Wall at the time this slab was cut was probably only in  
the process of erection. The letters are clearly cut and  
well formed; no ligatures are introduced; even the letters  
composing the diphthongs are not tied together. The style of 
the lettering indicates an early date, probably not later  
than the Riveling rescript in the time of Hadrian. 
  
If, as it seems probable from the size and character of the  
slab, it was attached to a building erected by the Prefect  
of the Ala, we may infer that this body of troops were at  
this time resident in Roman Carlisle. Had the inscription  
occurred on an altar, it might have been made when they were 
only resting there for a brief space. 
  
list, In no other inscription found in Britain except this  
are we informed that the Ala Petriana was entitled to the  
epithet of Augustus; that it consisted of a thousand men;  
that it was composed solely of Roman citizens; and for the  
first time the epithet Torquata occurs, as applied either to 
this body of troops or any other in Britain. As the troop  
was in Britain when Hadrian was, it may have received the  
epithet of Augusta for some deed of valour done in his  
presence. It seems too, to have consisted of 1,000 strong.  
It must have been much reduced in size before it took up its 
qtrs in the Walton House station, which has an area of only  
2 3/4 acres. It was at this time only recruited from the  
ranks of persons who, like the Apostle Paul, could boast of  
being Roman citizens. In the lower periods of the Empire  
this rule was probably departed from; though, indeed, the  
privilege was then so widely diffused as to become of little 
value. The epithet torquatus has not before been  
found in Britain as applied to any body of troops. It was a  
distinction of great rarity. In Ortelius's collection of  
Roman inscriptions the term only once occurs, and then,  
strangely enouigh, it occurs as applied to this same body of 
troops. It is an inscription which was found in Italy, and  
was erected to commemorate the merits of Caius Camurius  
Clemens, who, along with several other important commands,  
is said to have been "Prefect for the Administration of  
Justice of the Emperor Caesar Trajanus Augustus, and Prefect 
of the Ala Petriana, a military troop, consisting of Roman  
citizens, and twice 
  
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