Hagia Sophia
was built in the amazingly short time of five years. The daring
of the design, and perhaps the speed of the construction, made the
structure unstable. Its first dome fell after an earthquake, and
its replacement (in 563, with a higher profile than the original)
had to be repaired after partial collapses in the ninth and fourteenth
centuries.
The choice
of plan was decided and imposed by Justinian himself. Santa Sophia
does not have the basilical plan generally adopted for large buildings,
but is on the centralized pattern. The architectural form of Santa
Sophia is concealed by the richness of decoration. The walls, from
the ground up, are covered in identical manner. Plaques of red,
yellow and green marble blend with the mosaics, and these are further
embellished by the capitals, imposts, architraves and friezes.