The northern wall was treated on the same plan, but with the modifications rendered necessary by the union of the church with the earlier central church. The triple windows in the gable of that wall are therefore almost blocked by the roof of the central church against which it is built; while the three windows below the string-course are blind and are cut short by the arch opening into the central church, as that arch rises higher than the string-course. As explained, the gynaeceum above the inner narthex is divided by the open central bay of that narthex into two compartments, each consisting of two bays. The bays to the south are narrow, with transverse arches of decidedly elliptical form. A window divided by shafts in three lights, now built up, stood in the bay at the extreme south, and similar windows looked down into the open bay of the narthex from the bays on either hand. The northern compartment of the gynaeceum connects with the gynaeceum of the north church. In the interior the apse retains a large portion of its revetment of variously coloured marbles, and gives some idea of the original splendour of the decoration. Fragments of fine carving have been built into the pulpit of the mosque, and over it is a Byzantine canopy supported on twin columns looped together, like the twin columns on the façade of S. Mark's at Venice. The lateral apses are covered with cross-groined vaults, and project in three sides externally, while the central apse shows seven sides. All are lighted by triple windows, and decorated on the exterior with niches, like the other apses in this group of buildings, and those of S. Theodosia. In the brickwork found in the fabric of the Pantokrator, as Mr. W. S. George has pointed out, two sizes of brick are employed, a larger and a smaller size laid in alternate courses. The larger bricks look like old material used again. [Illustration: PLATE LXVIII. S. SAVIOUR PANTOKRATOR. INTERIOR OF THE EAST DOME IN THE CENTRAL CHURCH.] [Illustration: S. SAVIOUR PANTOKRATOR. INTERIOR OF THE DOME IN THE SOUTH CHURCH, LOOKING NORTH. _To face page 238._]