(For churches, etc., of 8th-10th centuries in the West, see Chapter XIII.) CHAPTER XI. BYZANTINE ARCHITECTURE. BOOKS RECOMMENDED: As before, Essenwein, Hübsch, Von Quast. Also, Bayet, _L’Art Byzantin_. Choisy, _L’Art de bâtir chez les Byzantins_. Lethaby and Swainson, _Sancta Sophia_. Ongania, _La Basilica di San Marco_. Pulgher, _Anciennes Églises Byzantines de Constantinople_. Salzenberg, _Altchristliche Baudenkmäle von Constantinopel_. Texier and Pullan, _Byzantine Architecture_. +ORIGIN AND CHARACTER.+ The decline and fall of Rome arrested the development of the basilican style in the West, as did the Arab conquest later in Syria. It was otherwise in the new Eastern capital founded by Constantine in the ancient Byzantium, which was rising in power and wealth while Rome lay in ruins. Situated at the strategic point of the natural highway of commerce between East and West, salubrious and enchantingly beautiful in its surroundings, the new capital grew rapidly from provincial insignificance to metropolitan importance. Its founder had embellished it with an extraordinary wealth of buildings, in which, owing to the scarcity of trained architects, quantity and cost doubtless outran quality. But at least the tameness of blindly followed precedent was avoided, and this departure from traditional tenets contributed undoubtedly to the originality of Byzantine architecture. A large part of the artisans employed in building were then, as now, from Asia Minor and the Ægean Islands, Greek in race if not in name. An Oriental taste for brilliant and harmonious color and for minute decoration spread over broad surfaces must have been stimulated by trade with the Far East and by constant contact with Oriental peoples, costumes, and arts. An Asiatic origin may also be assigned to the methods of vaulting employed, far more varied than the Roman, not only in form but also in materials and processes. From Roman architecture, however, the Byzantines borrowed the fundamental notion of their structural art; that, namely, of distributing the weights and strains of their vaulted structures upon isolated and massive points of support, strengthened by deep buttresses, internal or external, as the case might be. Roman, likewise, was the use of polished monolithic columns, and the incrustation of the piers and walls with panels of variegated marble, as well as the decoration of plastered surfaces by fresco and mosaic, and the use of _opus sectile_ and _opus Alexandrinum_ for the production of sumptuous marble pavements. In the first of these processes the color-figures of the pattern are formed each of a single piece of marble cut to the shape required; in the second the pattern is compounded of minute squares, triangles, and curved pieces of uniform size. Under these combined influences the artists of Constantinople wrought out new problems in construction and decoration, giving to all that they touched a new and striking character.