The insight into the state of research of the pre-Romanesque stone liturgical sculpture of Istria boosted the need for revision of the existent theses and a more thorough analysis of fragments, primarily from the southern part of the peninsula or areas that were within the borders of Pula Diocese in the early Middle Ages. They represent the largest collection within the Istrian corpus of early medieval sculpture, therefore one of the main goals of this thesis was to compile a comprehensive catalogue of relevant fragments of these stones. Considering the quantity and heterogeneity of the fragments as well as the context of their appearance within the Mediterranean influential area, the catalogue provides a complete and accurate descriptive and visual record with specific focus on their origin and comparative analyses in reference to the fragments of other areas in the region. Based on a detailed analysis of visual, morphological, iconographic and technical features, and the comparison of relief fragments of the liturgical sculpture along with distinguishing comparable elements or the so called "visual language" of individual sculptors, six workshops were defined. These workshops operated in the southern part of the peninsula producing liturgical furnishing for the churches in the period between the last quarter of the 8th and the end of the 9th century. According to the research results sixty churches were recognized as the original sites of the total of 494 stone fragments that are catalogued within four larger units conforming to territorial division. The first unit includes the city of Pula and the area close to the medieval city walls, while the remaining three areas roughly correspond to the borders of today's dioceses of Pula, Vodnjan and Rovinj. The number of sites within these areas varies. For each site, a brief description of the current situation and the historical phases of transformation (if any) is presented. A list of the relevant literature is provided, and in the catalogue the stone fragments are documented, analysed and interpreted.