Byzantine Churches in Constantinople: Their History and Architecture

by Alexander Van Millingen; Walter S. George; Arthur E. Henderson; Ramsay Traquair

Fig. 9.—The Dome on Pendentives.

It is most unfortunate that the domes of these three domed cross churches have been altered, especially as the domes of S. Mary Diaconissa and S. Theodosia are larger than any of the later domes except the large oval dome on the central church of the Pantokrator which is almost of the same size. It is therefore now difficult to say what was the precise form of the original domes. Most probably they were polygonal drum-domes, and their collapse owing to their size may well have led to the small drum-domes of later times. Though not strictly Byzantine these Turkish domes are of interest as showing the development of Byzantine forms under Turkish rule, and that reversion to the earlier drumless dome which is so marked a feature of the imperial mosques of the city.

Fig. 10.—The Drum Dome.

Domes are either eight, twelve, or sixteen sided, and usually have a window in each side. These numbers arise naturally from setting a window at each of the cardinal points and then placing one, two, or three windows between, according to the size of the dome. Internally the compartments are separated by broad, flat ribs, or are concave and form a series of ridges on the dome which die out towards the crown. In sixteen-sided domes of the latter type the alternate sides sometimes correspond to the piers outside, so that the dome which has sixteen sides within shows only eight sides without, as in the narthex of S. Theodore ([p. 246]). The octagonal dome of the Myrelaion ([p. 198]) seems to have had only four windows from the beginning.

The ribs of a Byzantine dome are not constructive in the same way as are the ribs of a Gothic vault. They were built along with the rest of the dome and of the same material, and are in no way separate from the infilling, though they no doubt strengthened the shell of the dome by their form[28]. On the outside a circular shaft with a very simple cap is often placed at the angles of the piers, and from these shafts the brick cornice springs in a series of arches over the windows. Sometimes the angle is formed by a point between two half-shafts, as in the domes of the narthex in S. Theodore (p. [ 246]).

External Treatment.—In the older churches the exterior seems to have been left in simple masses of brickwork, impressive only by their size and proportion. Probably even this effect was not considered of great importance. In later times a very beautiful system of decoration with slender shallow niches was introduced and was applied in particular to the east end and to the apses. The finest examples of this system on a large scale are seen at the Pantokrator (p. [235]) and S. Theodosia (p. [173]). Carefully considered or elaborate external compositions are rare, and the only examples in Constantinople are the side chapel of the Pammakaristos (p. [154]) and the narthex of S. Theodore (p. [246]).

External Marble and Mosaic.—Marble and mosaic, we have reason to know, were occasionally used on the exterior of churches,[29] though no fragments remain. On the south side of the Pantepoptes (p. [216]) the string-course does not correspond to the line of the walls, but projects in a manner which shows that marble must have been employed to line the large windows. A similar projection of the string-course or cornice is not uncommon elsewhere, though not so evident as in the Pantepoptes, and may have been made to receive a marble or mosaic lining.

Doors and Windows.—It is a primary rule in Byzantine architecture that all constructive openings are arched. Whatever may be the eventual form of a door or window the opening is first built in brick with a semicircular head, and into this opening the marble jambs and lining are fitted leaving a semicircular lunette above. Doors are square-headed, with heavily moulded architraves and cornice, and the lintel is mitred into the jambs instead of having the more constructive horizontal joint used in the West.

The doors made of wood or of wood lined with bronze, swing on top and bottom pivots which turned in bronze-lined sockets in lintel and threshold. They closed with a rebate in the jambs and against the raised threshold. Windows were sometimes filled in a similar manner, as in the palace of the Porphyrogenitus and in the north gallery of S. Saviour in the Chora (Fig. [100]). In the latter double windows or shutters were employed, opening inwards in the same way as did the doors. These shutters may perhaps be regarded as domestic, for in the churches, as is still seen in S. Sophia though the arrangement has vanished elsewhere, the entire arched opening was usually filled in with a pierced marble grille.