+LOMBARD STYLE.+ Owing to the general rebuilding of ancient churches under the more settled social conditions of the eleventh and twelfth centuries, little remains to us of the architecture of the three preceding centuries in Italy, except the Roman basilicas and a few baptisteries and circular churches, already mentioned in Chapter X. The so-called Lombard monuments belong mainly to the eleventh and twelfth centuries. They are found not only in Lombardy, but also in Venetia and the Æmilia. Milan, Pavia, Piacenza, Bologna, and Verona were important centres of development of this style. The churches were nearly all vaulted, but the plans were basilican, with such variations as resulted from efforts to meet the exigencies of vaulted construction. The nave was narrowed, and instead of rows of columns carrying a thin clearstory wall, a few massive piers of masonry, connected by broad pier-arches, supported the heavy ribs of the groined vaulting, as in S. Ambrogio, Milan (Fig. 90). To resist the thrust of the main vault, the clearstory was sometimes suppressed, the side aisle carried up in two stories forming galleries, and rows of chapels added at the sides, their partitions forming buttresses. The piers were often of clustered section, the better to receive the various arches and ribs they supported. The vaulting was in square divisions or _vaulting-bays_, each embracing two pier-arches which met upon an intermediate pier lighter than the others. Thus the whole aspect of the interior was revolutionized. The lightness, spaciousness, and decorative elegance of the basilicas were here exchanged for a sombre and massive dignity severe in its plainness. The Choir was sometimes raised a few feet above the nave, to allow of a crypt and _confessio_ beneath, reached by broad flights of steps from the nave. Sta. Maria della Pieve at Arezzo (9th-11th century), +S. Michele+ at Pavia (late 11th century), the +Cathedral of Piacenza+ (1122), +S. Ambrogio+ at Milan (12th century), and +S. Zeno+ at Verona (1139) are notable monuments of this style. +LOMBARD EXTERIORS.+ The few architectural embellishments employed on the simple exteriors of the Lombard churches were usually effective and well composed. Slender columnettes or long pilasters, blind arcades, and open arcaded galleries under the eaves gave light and shade to these exteriors. The façades were mere frontispieces with a single broad gable, the three aisles of the church being merely suggested by flat or round pilasters dividing the front (Fig 91). Gabled porches, with columns resting on the backs of lions or monsters, adorned the doorways. The carving was often of a fierce and grotesque character. Detached bell-towers or _campaniles_ adjoined many of these churches; square and simple in mass, but with well-distributed openings and well-proportioned belfries (Piacenza S. Zeno at Verona, etc.).[18] [Footnote 18: See Appendix B.]