rlier and later lists
also. Nennius, as is to be expected, draws most of his names from the
districts which the Saxons had not yet reached; all being given with
the Celtic prefix _Caer_ (=city).

B. 4.--Amid all these snares the most certain identification of a
Roman site is furnished by the discovery of inscriptions relating to
the special troops with which the name is associated in historical
documents. When, for example, we find in the Roman station at
Birdoswald, on the Wall of Hadrian, an inscription recording the
occupation of the spot by a Dacian cohort, and read in the 'Notitia'
that such a cohort was posted at _Amboglanna per lineam Valli_, we
are sure that Amboglanna and Birdoswald are identical. This method,
unfortunately, helps us very little except on the Wall, for the
legionary inscriptions elsewhere are found in many places with which
history does not particularly associate the individual legions thus
commemorated.[204] However, the special number of such traces of the
Second Legion at Caerleon, the Twentieth at Chester, and the Sixth at
York, would alone justify us in certainly determining those places
to be the Isca, Deva, and Eboracum given as their respective
head-quarters in our documentary and historical evidence.

B. 5.--In the case of York another proof is available; for the name,
different as it sounds, can be traced, by a continuous stream of
linguistic development, through the Old English Eorfowic to the Roman
_Eboracum_. In the same way the name of _Dubris_ has unmistakably
survived in Dover, _Lemannae_ in Lympne, _Regulbium_ in Reculver.
_Colonia, Glevum_, _Venta, Corinium, Danum_, and _Mancunium_, with the
suffix "chester,"[205] have become Colchester, Gloucester, Winchester,
Cirencester, Doncaster, and Manchester. Lincoln is _Lindum Colonia_,
Richborough, _Ritupis_; while the phonetic value of the word London
has remained absolutely unaltered from the very first, and varies but
slightly even in its historical orthography.

B. 6.--With names of this class, of which there are about thirty,
for a starting-point, we can next, by the aid of our various lists
(especially Ptolemy's, which gives the tribe in which each town lies,
and the 'Itinerary'), assign, with a very high degree of probability,
some thirty more--similarity of name being still more or less of
a guide. For example, when midway between _Venta_ (Winchester) and
_Sorbiodunum_ (Sarum) the 'Itinerary' places _Brige_, and the name