8th-century Byzantine domes
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With the decline in the empire's resources following losses in population and territory, domes in Byzantine architecture were used as part of more modest new buildings. The large-scale churches of Byzantium were, however, kept in good repair.[1] By bracing the dome with broad arches on all four sides, the cross-domed unit provided a more secure structural system.[2] These units, with most domes raised on drums, became a standard element on a smaller scale in later Byzantine church architecture, and all domes built after the transitional period were braced with bilateral symmetry.[3]

The upper portion of the Church of Hagia Irene was thoroughly rebuilt after the 740 Constantinople earthquake. The nave was re-covered with an elliptical domical vault hidden externally by a low cylinder on the roof, in place of the earlier barrel vaulted ceiling, and the original central dome from the Justinian era was replaced with one raised upon a high windowed drum. The barrel vaults supporting these two new domes were also extended out over the side aisles, creating cross-domed units.[1]
The dome over the Church of the Archangels at Sige was replaced in the 19th century, but the original was dated in the 18th century to 780.[4]
Turkey
Part of the fifth-century basilica of St. Mary at Ephesus seems to have been rebuilt in the eighth century as a cross-domed church, a development typical of the seventh to eighth centuries and similar to the cross-domed examples of Hagia Sophia in Thessaloniki, St. Nicholas at Myra, St. Clement's at Ankara, and the church of the Koimesis at Nicaea.[5]
A small, unisex monastic community in Bithynia, near Constantinople, may have developed the cross-in-square plan church during the Iconoclastic period, which would explain the plan's small scale and unified naos. The ruined church of St. John at Pelekete Monastery is an early example.[6] Monks had supported the use of icons, unlike the government-appointed secular clergy, and monasticism would become increasingly popular. A new type of privately funded urban monastery developed from the 9th century on, which may help to explain the small size of subsequent building.[7]