A new architectural type of church, as well as a new kind of masonry, both of Constantinopolitan provenance, were introduced in Ayia Sophia (Holy Wisdom) in Thessalonike. The church represents an early stage of the development of the domed cruciform type, the creation of which was a consequence of the final codification of the Byzantine liturgy.
The masonry comprised alternating courses of ashlar and bricks, whereas the earlier churches were built of undressed stones and zones of bricks. The type of the katholikon of the monastery of Ayios Andreas at Peristera (tetrachonch cruciform with tripartite sanctuary) derives from mausoleia and 'martyria' of Late Antiquity. This is explained by the fact that the katholikon was built on the site of an Early Christian tetraconch church the remains of which were incorporated in it.