Architecture of Fenari Isa Mosque

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North Church:

The north church resembles to a great extent the Bodrum Mosque (the church of Myrelaion) . It has an unusual quincuncial plan and was one of the first churches in Constantinople to adopt such plan . The north church is smaller than the south one . It measures about 13m long and 9 . 5m wide . The masonry has alternating courses of bricks and small rough stone blocks .

There are three high apses . The central apse is polygonal in shape and the other two are flanking it . Between the apses , there are triple and single lancet windows . There are four small roof chapels each surmounted by a cupola at the four edges of the nave .

Remainders of the original decoration of the north church form the bases of three of the four columns of the central bay as well as many other original decorating elements that appear on the pillars of the windows and on the frame of the dome . The remaining decoration was originally in marble panels and colored tiles , while the vaults were decorated with mosaic .

South Church:

The south church has a square plan roofed by a dome , and surrounded by two deambulatoria , an esonarthex and a parekklesion that was added later . The north deambulatorium is the south parekklesion of the north church . The central room is divided by a triple arcade . The masonry has alternating courses of bricks and rough stone blocks which is typical of the late Byzantine architecture in Constantinople .

The church has an exonarthex which is surmounted by a gallery that was extended to the north church . The parekklesion in the southern side of the south church is now connected with the esonarthex , so that the room is surrounding the whole complex on the west and south side . There are several marble sarcophagi placed within the room .