The first photo is of a ceiling mosaic depicting in the center the Virgin Mary with the Christ Child: on the left side as you look at it is a model of Constantine with his new city of Constantinople and on the right Constantine with a model of his new Church.
The above photo and the one after it record the existence of Hagia Sophia in the heyday of the 6th-century Roman Emperor Justinian.
The above photo, as you can see, records a 9th century mosaic panel of the Archangel Gabriel and the last one a dateless marking of the place in the Hagia Sophia where emperors were crowned.
Taken together these photos speak to me, along with the wonders of Byzantine art in the first one, an excessive partnership between Church and State during the Byzantine period. That situation has persisted in many places and is by no means confined to Eastern Orthodox, Roman Catholic, and Islamic religions.