Cross-in-square

The term cross-in-square (French, église à croix inscrite; German, Kreuzkuppelkirche) or crossed-dome denotes the dominant architectural form of middle- and late-period Byzantine churches. The first cross-in-square churches were probably built in the late 8th century, and the form has remained in use throughout the Orthodox world until the present day. In the West, Donato Bramante's first design (1506) for St. Peter's Basilica was a centrally-planned cross-in-square under a dome and four subsidiary domes.