This ruin, so minutely described by many Antiquaries, will afford to curious and learned observers, a valuable specimen of the mode of building practised by the Romans, but the uses for which it was designed, will, most probably, for ever elude their researches. They will not however, forbear their conjectures concerning it; of these, two have obtained most credit; one, that it was a temple of the Roman Janus; and the other, the Janua, or great Gate-way, of the Roman town. The latter seems chiefly supported by the assertion of the learned Leman, that the line of the Fosse, having joined the Via Devana, runs thro' this spot. But whoever minutely examines the arches, will not easily overcome the objections which the work affords to oppose this opinion; or assign a reason why a city no larger than our Ratae should have a Gateway with so many openings; nor does any satisfactory answer occur to the query why a gate should be placed in what seems to have been the central part of the antient city. And perhaps all the evidence for the other opinion rests upon the dark sooty coat that encrusts the interior of the arches; an appearance which the smoak of the town would easily produce in one century. Indeed, little, it seems, can be concluded from the present outside of the work; for as we cannot conceive that the Romans would have elected so rough an edifice, it must be supposed that the present remains were originally coated with workmanship more worthy of such polished builders. If, however we must indulge a conjecture, we shall be led to imagine, from the slight remain of ornament, which is only the fragment of a niche, that this wall was either part of a Roman temple or bath. Still however such an opinion rests, and must rest, on nothing but conjecture, since the remains are too scanty to afford sufficient data for a settled opinion. Thus may we take our leave of this remarkable object, which, tho' incontrovertibly of Roman origin, and likely to exist when the church built with its stolen spoils shall be no more, must continue for ever, as it is at present, an interesting mystery. The adjoining church of St. Nicholas is a small edifice of very rude and consequently very antient construction. It has evidently been built at different periods. It consists only of two aisles, the north one having long since been taken down; the south aisle is gothic, and the other, properly the nave, is of that massy unornamented style, in use before and at the conquest; from the circumstance of its being built with the materials of the neighbouring Roman work, it will perhaps be no anachronism to assign to it a date prior to that period. The tower is also Saxon; and the spire having been damaged by the wind is now taken down.