Let us then assume that there was a Roman church in existence on St. Martin's Hill when Augustine came to Canterbury. Is there any evidence to strengthen this assumption in the present building? And, first, as regards the Nave. We have already alluded to what we consider the valuable evidence supplied by the style and texture of the _pink_ plaster, also the variation of the mortar in the construction of the west windows from _white_ mortar in the joints to _pink_ mortar in the voussoirs of the arch, as well as the Roman-like character of the windows themselves. The objection that "Roman windows were never splayed" may be met (_a_) by the general statement that the introduction of light by means of a splay is so natural that the idea could not have escaped a Roman builder, especially in countries where there was less light than in Italy. Isidore of Seville, a contemporary of Gregory the Great, living in the midst of Roman work, must be describing what were the distinctive features of windows around him when he says "Fenestræ sunt quibus pars exterior angusta, et interior diffusa est"; and (_b_) Mr Roach Smith, in his "_Collectanea Antiqua_" gives several illustrations of Roman splayed windows at Aries, Vienne, etc., and we are informed that there is one at South Shields, mentioned by Mr Robert Blair, F.S.A. The character of the walls in the nave of St. Martin's seems to us to agree pretty closely with the technical description of Roman masonry in this country as "chiefly constructed of stone or flint, according to the part of the country in which one or the other material prevailed, embedded in mortar, and bonded at certain intervals throughout with regular courses or layers of large flat bricks or tiles, which, from the inequality of thickness and size, do not appear to have been shaped in any regular mould."