First among the buildings as among the works of art, in the estimation of every citizen, was Hagia Sophia. It was emphatically the Great Church. Tried by any test, it is one of the most beautiful of human creations. Nothing in Western Europe even now gives a spectator who is able with an educated eye to restore it to something like its former condition, so deep an impression of unity, harmony, richness, and beauty in decoration as does the interior of the masterpiece of Justinian. All that wealth could supply and art produce had been lavished upon its interior--at that time, and for long afterward, the only portion of a church which the Christian architect thought deserving of study. "Internally, at least," says a great authority on architecture, "the verdict seems inevitable that Santa Sophia is the most perfect and most beautiful church which has yet been erected by any Christian people. When its furniture was complete the verdict would have been still more strongly in its favor." We have seen that to Nicetas, who knew and loved it in its best days, it was a model of celestial beauty, a glimpse of heaven itself. To the more sober English observer, "its mosaic of marble slabs of various patterns and beautiful colors, the domes, roofs, and curved surfaces, with gold-grounded mosaic relieved by figures or architectural devices," are "wonderfully grand and pleasing." All that St. Mark's is to Venice, Hagia Sophia was to Constantinople. But St. Mark's, though enriched with some of the spoils of its great original, is, as to its interior at least, a feeble copy. Hagia Sophia justified its founder in declaring, "I have surpassed thee, O Solomon!" and during seven centuries after Justinian his successors had each attempted to add to its wealth and its decoration. Yet this, incomparably the most beautiful church in Christendom, at the opening of the thirteenth century was stripped and plundered of every ornament which could be carried away. It appeared to the indignant Greeks that the very stones would be torn from the walls by these intruders, to whom nothing was sacred.