It is a three-naved unvaulted basilica with a semi-circular apse, a narthex and an atrium.

The church has a total length of 25.5 m and a width of 13 m. The division into three naves was effected by two rows of five pillars each.

The middle nave (9.3 m wide) ends to the east with a big closed apse, round outside and three-sided inside.

It has mixed masonry of stone and brick and is the largest of the Nesebar churches whose overground structure has survived.

During the Middle Ages it served as a cathedral for the bishopric eparchy centered in Nesebar.