The Church is one of the earliest of the so-called merchant churches. It was located directly on an important trade route from Prague to the Kievan Rus. It consists of two rooms: First of them is the proper Church, the other is the burial chapel added in the 11th century. Burials of women were found within it. A controversial baptismal bowl is variously interpreted by research centres. It is probably an evidence of baptism in the Eastern rite by the Vistulans, which is mentioned in the so-called Pannonian Legend included in the Lives of St. Methodius describing the moment of the Christianization of the area.