Hagia Sophia, Istanbul: the central door from the narthex to the nave known as the Imperial Gate

NOTES: This image was probably taken between 1890-1910. The photographers Jean (Johannes) Sebah (son of Pascal Sebah who set up his studio from the 1860s) formed a partnership with Polycarpe Joaillier from 1890. Joaillier returned to Paris in the early 1900s, but Jean Sebah continued the work of the studio with others until 1943.