Greater operations were realized in the period from 1999-2002. During that period, revision archaeological researches were performed inside and around the Church of St. Clement, where the phases of the building were fully discovered and the monumental three-nave Early Christian basilica was completely discovered. It is composed of narthex, atrium, baptistery, utility rooms and wide courtyards in the eastern part of the complex. In the spacious atrium on the north side of the building a large number of marble columns with bases and capitals have been discovered. In the narthex and the northern nave from the basilica there are preserved mosaic floors in several stages.
The most representative part of this basilica is its monumental baptistery, located south of its apse, with an exceptionally preserved mosaic floor. It has a form of a rectangle, in which the central part is a circular piscine. It is a pool in which the baptism took place by a staircase on the east side, which went down to the pool. The mosaic decoration on its floor consists of geometric ornaments and symbolic plant and zoomorphic representations. Here, there are stylized representations of vines with bunches, leaves, flowers and quite realistically represented domestic and wild animals and birds, like lamb, lion, peacock, cock, bar birds. In the circular fields of the floorboard, formed by two interlaced strips, among other representations, there are also various forms of crosses, among which is the swastika.
