PLATE III
METHUSELAH,
CANTERBURY, ORIGINALLY IN CHOIR CLERESTORY
Twelfth Century
It was not, however, till the first century of the Christian Era that any one seems to have thought of using glass to fill windows. In Egypt naturally the climate made it unnecessary, and even in Italy, where it can be cold enough in winter, civilization had evolved a style of architecture independent of glass.
Roman windows.
Nevertheless it was introduced in Rome under the first emperors. Caligula had his palace windows glazed, and Seneca mentions it as one of the luxuries which had been introduced into life in his time, but which did not really add to a philosopher's happiness. Its introduction was, however, very gradual, and even two centuries later its use was still quoted as evidence of excessive luxuriousness.
Remains of these Roman windows have been found at Pompeii and elsewhere. At Pompeii they are in the form of small panes of glass held, in one case in a wooden, and in another in a bronze lattice.[2] It must be remembered that large panes were not available. Another method seems to have been to set panes of glass directly into small openings in stone-work.
When coloured glass was first used in windows we have no evidence to enable us to say. As, however, the manufacture of coloured glass was already a flourishing art it cannot have been long before the idea came of using it to decorate windows.
St. Sophia.
Whether the windows of St. Sophia at Constantinople originally had colour in them or not, is not quite certain. That they were glazed we know, from the description of the church by Paul the Silentiary, an officer of Justinian's court, but his language about them is tantalizingly vague. From his enthusiasm at the effect of the sunlight through them I am inclined to suspect that they were coloured, though he does not definitely say so. Of this glass, which seems to have been fixed in small rectangular openings in a slab of alabaster, nothing, I believe, remains; but similar work—coloured—is to be seen in other mosques, the only difference being that the openings in the slab are formed into patterns and kept very small. (I have already mentioned the necessity, when dealing with clear coloured glass, of keeping the pieces small and contrasting them with plenty of solid dark.)