in Britain, distant 22 miles, according to the Itinerary, from Venta Belgarum, in the direction of the Thames.
In the seventh Iter
this town is specified as Calleva Attrebatum.
In the twelfth it is simply Calleva.
How far does this justify us in separating the two towns?
It simply indicates the likelihood of there having been another Calleva somewhere.
It by no means proves that the Calleva of the twelfth Iter
was such a second one. Hence, the identity or difference is to be determined by the special evidence of the case. Now, a similar inconsistency--as is remarked by Horsley--occurs in the notice of Isurium.
In one Iter
it is Isurium Brigantum,
in another, simply Isurium.
Hence, the assumption of a second Calleva, mentioned by any extant author,
is unnecessary. Of the one in question, Silchester
is the generally recognised modern equivalent.