But independent of examples afforded by some few ancient Roman churches, and such of the temples and public buildings of the Romans as were then remaining in Britain, the Saxon converts were directed and assisted in the science of architecture by those missionaries from Rome who propagated Christianity amongst them; and during the Saxon dynasty architects and workmen were frequently procured from abroad, to plan and raise ecclesiastical structures. The Anglo-Saxon churches were, however, rudely built, and, as far as can be ascertained, with some few exceptions, were of no great dimensions and almost entirely devoid of ornamental mouldings, though in some instances decorative sculpture and mouldings are to be met with; but in the repeated incursions of the Danes, in the ninth and tenth centuries, so general was the destruction of the monasteries and churches, which, when the country became tranquil, were rebuilt by the Normans, that we have, in fact, comparatively few churches existing which we may reasonably presume, or really know, to have been erected in an Anglo-Saxon age. Many of the earlier writers on this subject have, however, caused much confusion by applying the term ‘SAXON’ to all churches and other edifices contradistinguished from the pointed style by semicircular-headed doorways, windows, and arches. But the vestiges of Anglo-Saxon architecture have been as yet so little studied or known, as to render it difficult to point out, either generally or in detail, in what their peculiarities consist: the style may, however, be said to have approximated in appearance much nearer to the Debased Roman style of masonry than the Norman, and to have been also much ruder: and in the most ancient churches, as in that at Dover Castle, and that at Bricksworth, we find arches constructed of flat bricks or tiles, set edgewise, which was also a Roman fashion. The masonry was chiefly composed of rubble, with ashlar or squared blocks of stone at the angles, disposed in courses in a peculiar manner. [Illustration: Anglo-Saxon Arches, Bricksworth Church, Northamptonshire (7th. cent.)]