Dimensions: Nave, 38 by 25 ft.; Chancel, 40 by 14 ft.
But, supposing we take literally the words of Bede, that the church "dedicated to the honour of St. Martin, was built of old, while the Romans still occupied Britain," we are met by this apparent difficulty. If (as is maintained) the church was built in the fourth century, how came it to be dedicated to St. Martin, who died about 397? Some colourable support to the possibility of this can be derived from the fact that the first stone church built in Scotland (at Whithern) by St. Ninian was certainly dedicated to the same saint. There are indeed, in that case, some special reasons, because St. Ninian, a personal friend of St. Martin, called on him at Tours, and received from him workmen accustomed to the Roman method of building, with whom he returned home. As the church was in course of erection, the news of St. Martin's death reached him, and the church was in consequence dedicated in 398 to his memory. There need be no difficulty on the doubtfulness of such an early Canonization. The first formal act of canonization by a Pope did not take place till the ninth or tenth century. Before this, it was done in a somewhat irregular manner by the bishop of the diocese, who recited the names of the departed martyrs, or holy men, in the Canon of the mass, not for invocation, but in memory of those who had finished their course, and for an example to others. It has been asserted that St. Martin was the first person to be honoured as a confessor, that is, that he was the first who was treated as a saint without being a martyr. In the antiphon to the Magnificat on his festival we have, "sanctissima anima, quam etsi gladius persecutoris non abstulit, palman tamen martyrii non amisit." Though there were other St. Martins, such as the Bishop of Vienne, a Bishop of Tongres at the end of the third century, and a Bishop of Trêves, yet there can be little doubt that the one alluded to by Bede was the Bishop of Tours, whose fame had completely overshadowed the rest.
Now there is one suggestion that deserves a passing notice, and that is, the possibility of St. Martin himself having been the founder of the church; even in a closer sense than by merely sending masons from his monastery, as he did to St. Ninian. In the constant interchange of communication between Britain and Gaul, not only for commercial but for military purposes, it may have happened that Christians had migrated, or been transferred, from Tours to Kent—and for the benefit of Christian soldiers, St. Martin, once a soldier himself, may have urged the erection of a church. It is unnatural to suppose that St. Martin, who travelled over a great part of Gaul, did not in some way associate himself with Britons, with whom he would have been brought into contact. We know this, at any rate, that during the latter year of his episcopate he exercised great influence over the Emperor Maximus and his Empress—and Maximus had resided for several years in Britain, was proclaimed emperor there in 383, had thence invaded Gaul with a fleet and army, which were long afterwards remembered as the "emigration of a considerable part of the British nation," and finally settled at Trêves, where he was more than once visited by St. Martin. Some of these British emigrants or soldiers would very naturally have returned to their native country and brought Christianity with them. There is no conclusive reason why St. Martin himself, either prompted thereto by Maximus, or yielding to the entreaties of Britons whom he met at Trêves or elsewhere in Gaul, should not have visited Canterbury in person, and there founded the church. It is remarked by Haddan and Stubbs that "it was a peculiarity of British Christians that churches were not dedicated to any saint already dead, after the fashion then beginning to be common, but were called by the name of their living founder." Or the original dedication made by St. Martin (acting either directly or indirectly) may have fallen into popular disuse, and been supplanted by his own name, as was the case with the church of St. Gregory on the Cœlian Hill, which St. Gregory had dedicated to St. Andrew, but which soon after came to be called after himself, though he was not buried there. And attention may be directed to instances of a similar kind at Rome, where the names of founders lingered on in churches like the Basilica Constantiniana, Basilica Liberiana, and St. Lorenzo in Damaso. We may also note the fact, that a chapel in Canterbury Cathedral, originally dedicated to St. Peter and St. Paul, soon acquired the name of its founder, St. Anselm, and even the great Cathedral itself, the "Church of Christ," was popularly known in the Middle Ages as the Church of St. Thomas. These latter instances are not indeed exactly parallel, because the relics of the name-saints were actually buried in these places, but they may be quoted as showing how readily the original dedication may have been subsequently changed; and it would not be difficult to give additional examples.
Before proceeding to a minute description of the principal objects of interest outside the church, we may say a few words about the walls, which, however, have been so patched and repaired in successive ages, that they have lost all signs of uniformity. The thickness of the walls is, on an average, about 2 ft., and this dimension is noticeable, because we meet with it over and over again in Roman villas. The materials, too, are similar, and resemble what have been found in villas—a mass of rather rough walling, partly of brick, partly of stone, evidently intended to be plastered on both sides, and, to a great extent, built with hard "sea-shore" mortar. This mortar is composed of pebbles, small shells, etc., and is of such remarkable solidity and strength that, although the walls of the church are thin and lofty, they have sustained without any injury, and with comparatively low buttresses, the thrust of a high-pitched Gothic roof. It was not uncommon for churches to be erected on the site of, and using part of the structure of, Roman secular buildings, or temples. And we give for what it is worth the opinion of Mr Roach Smith, an experienced antiquary, who gave special attention to Roman work, and who states in a letter written on January 6, 1883: "There are many examples of churches being built upon the remains of Roman buildings, no doubt often temples, and not unfrequently of a small size. Some instances are very remarkable, as that of Britford, near Salisbury, at old Verulam, etc. I have ever had a belief that St. Martin's Church is founded upon, or built upon, or built into, a Roman temple."
The walls of the church form an interesting study, not only for their venerable aspect, but also for their irregularity. The brick courses in the Nave are pretty general throughout, sometimes at 9 inches apart, sometimes as much as 20 inches, or even more. A great deal of old plaster is found externally in the middle of the south wall of the nave, and there are masses of Roman bricks congregated at the east and west ends of the same wall (the angles of the walls in public buildings being often composed entirely of bricks); and we find also, in parts, large blocks of grey stone, as well as pieces of travertine, tertiary sandstone, Kentish rag, red sandstone, Purbeck marble, chalk, and many other geological specimens. Here and there, interspersed with Roman bricks, are patches of "chequy" masonry, the stones being placed at wide intervals, notably on the south-east corner, and on the north side.
The masonry of the early chancel is, however, entirely different, being composed of Roman bricks laid evenly upon one another with narrow joints, averaging four bricks to a foot. In many instances the arrises of these bricks are sharp and true, showing no sign of having been taken from any other building; in other cases they are more fragmentary, but we can have no hesitation in saying that the walling of the early chancel is well-built, satisfactory to a professional eye.
We have then these two distinct modes of building (1) Roman bricks laid evenly and closely upon one another, (2) stone-work with courses of Roman brick at various intervals. And we shall have to consider hereafter whether these are genuine Roman walls, or are merely composed of Roman materials used up for the second time, as at St. Albans and elsewhere.
We learn from competent authorities that there were five or six kinds of Roman wall-building—(a) The quadrangular, with masses of square or oblong stones laid alternately lengthwise and cross-wise, not cemented by mortar, but bound together by leaden clamps, such as is found in the so-called wall of Romulus on the Palatine; (b) polygonal masonry, where the stones are irregular, and with small stone splinters wedged into the joints where necessary; (c) concrete—rude, without ornamentation, which has at a distance the appearance of being panelled, since beams of timber are let in to strengthen it, or sometimes thin layers of brick to prevent settlement in the concrete from the shrinking of the lime when it cools and dries; (d) opus reticulatum, which consists of stone net-work of diamond-shaped blocks, as in the "Muro Torto" at Rome; (e) opus lateritium, the ordinary construction of bricks laid evenly upon one another (f) mixture—i.e. stones bonded together with courses of bricks, sometimes at regular, often at irregular, intervals. Mr Parker, in his "Archæology of Rome," referring to the mixture (i.e. the style of the building used in the nave) which is so constant in Roman wall-work, in England and Northern Europe generally, says that in itself it is no evidence of date as to the period of Roman work, since other things must be taken into account: but that it is found in the circus of Maxentius, and many other places. It is usually attributed to the beginning of the fourth century, but it occurs also at Pompeii, in parts of the substructure of the walls of Aurelian, in tombs of the second century at Ostia, and in some of the foundations of Hadrian's villa near Tivoli.
With regard to the comparative antiquity of the nave and chancel, no positive judgment has yet been arrived at. Hasted, indeed, ventured on the opinion that the latter was the more ancient, but he also believed that the chancel was built about the year 200 A.D., and had not the benefit of the recent explorations, so that his opinion is, in itself, of little value. But it has been adopted on scientific and architectural grounds by the Rev. G. M. Livett (who has paid careful attention to the architecture and masonry of the church) and by other distinguished antiquaries. Their arguments are very forcible, and there is much reason for believing that the theory will hereafter find general acceptance, although at present further investigation is necessary before it can be pronounced as incontrovertible.