These mosaics belong to very various dates.
Two side niches contain the earliest known mosaics of distinctively Christian subjects.
Glass for mosaics was also largely made and exported.
The mosaics of the domes would seem to belong to the 12th century, probably before 1150.
Apart from the illuminated MSS., the mural paintings, the mosaics, and the goldsmith's work of Mount Athos are of infinite interest to the student of Byzantine art.