the wall itself, Turkish.
Pilasters are placed at the angles and at the apse.

On the south side of the church is a cistern, the roof of which rests on
twenty-three columns crowned by beautiful Corinthian capitals.

NOTE

The full text of the description given of the church of S. John,
mentioned by Ruy Gonzalez de Clavijo, reads as follows:--

E la primera parte (puerta?) de la Iglesia es muy alta e de obra rica,
e delante desta puerta esta un grand corral y luego al cuerpo de la
Iglesia, e el qual cuerpo es una quadra redonda sin esquinas muy
alta, e es cerrada al derredor de tres grandes naves, que son cubiertas
da un cielo ellas y la quadra. E ha en ella siete altares, e el cielo
desta quadra e naves e las paredes es de obra de musayca muy ricamente
labrada, e en ello muchas historias, e la quadra esta armada
sobre veinte e quatro marmoles de jaspe verde, e las dichas naves son
sobradadas, e los sobrados dellas salen al cuerpo de la Iglesia, e alli
avia otros veinte e quatro marmoles de jaspe verde, e il cielo de la
quadra e las paredes e de obra musayca, e los andamios de las naves
salen sobre el cuerpo de la Iglesia, e alli do avia de aver verjas avia
marmoles pequenos de jaspe.[79]

With the kind help of Professor Cossio of Madrid, the Spanish
text may be roughly translated as follows:--

And the first part (door?) of the church is very lofty and richly
worked. And before this door is a large court beside the body of
the church; and the said body is a round hall without corners (or
angles), very lofty, and enclosed round about by three large naves,
which are covered, they and the hall, by one roof. And it (the
church) has in it seven altars; and the roof of the hall and naves and
the walls are of mosaic work very richly wrought, in which are
(depicted) many histories. And the (roof of the) hall is placed on
twenty-four marble columns of green jasper (verd antique). And
the said naves have galleries, and the galleries open on the body of
the church, and these have other twenty-four marble columns of
green jasper; and the roof of the hall and the walls are of mosaic
work. And the elevated walks of the naves open over the body
of the church,[80] and where a balustrade should be found there are
small marble columns of jasper.

Outside the church, adds the ambassador, was a beautiful chapel
dedicated to S. Mary, remarkable for its mosaics.