11th-century Byzantine domes

Most new Byzantine churches in the 11th century were variations of the cross-in-square type, but a new domed octagon type was used in "in relatively large, wealthy buildings in Greece and the region directly influenced by the capital." In Constantinople, drums with twelve or fourteen sides were popular beginning in the 11th century. Middle Byzantine architecture in Constantinople put particular emphasis on the design of the dome and apse, beginning in the 11th century.