The mosaics of the domes would seem to belong to the 12th century, probably before 1150.
Numerous other domes exist, and many deep pits.
THOLOS (06Xos), the term given in Greek architecture to a circular building, with or without a peristyle; the earliest examples are those of the beehive tombs at Mycenae and in other parts of Greece, which were covered by domes built in horizontal courses of masonry.
2 and 3 are bounded by the domes d and f and the basal pinacoid c; fig.
The dome is the leading idea or motif in Byzantine ecclesiastical architecture; the domes are placed over square, not circular apartments, and their bases are brought to a circle by means of pendentives.