Hagia Sophia. Columns
At the entrance, pay attention to the dark columns, arranged in four to the left and right in the semicircular niches of the main nave (Exedra).

The columns are carved from porphyry and borrowed from some Roman temple - at the time of the construction of Sofia, the technology of manufacturing solid columns from porphyry was lost.

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Второй ярус центральной части поддерживают колонны из фесалийского мрамора.

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