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Byzantine architecture, building style of Constantinople (now Istanbul, formerly ancient Byzantium) after ad 330. Byzantine architects were eclectic, at first drawing heavily on Roman temple features. Their combination of the basilica and symmetrical central-plan (circular or polygonal) religious structures resulted in the characteristic Byzantine Greek-cross-plan church, with a square central mass and four arms of equal length. The most distinctive feature was the domed roof. To allow a dome to rest above a square base,...