[Caermarthen appears to have been the _Maridunum_ of Ptolemy, and
the _Muridunum_ of Antoninus, one of the principal stations in the
country of the Dimetæ, situated on the Via Julia, or great Roman
road. Its modern name of Caermarthen, or _Caer Fyrdden_, as it is
called by the Welsh (by a change of the convertible consonants _f_
and _m_, common in their language), implies "a military station
fortified with walls," and perfectly agrees with the description
given by Giraldus Cambrensis, who calls it, "Urbs antiqua
coctilibus muris."]
"_Mediæval and Middle Ages._"--These terms are now in constant use, and
very differently and vaguely defined. Will any of your correspondents,
antiquaries or historians, say what period is comprehended in these
terms, and give the date when it should commence, and when terminate?