The introductory part of the thesis describes the context of the Pauline Fathers and their monasteries in Istria in the 18th century, followed by an overview of the beginnings of the monastery in Sveti Petar u Šumi after the Pauline Fathers had taken it over from the Benedictines during the 15th century, and a short review of the architectural history of both the monastery and the church of St. Peter and Paul. The following chapters cover a detailed catalog and contextual description of the church furniture made by Paulus Riedl, which includes five altars, the pulpit, two confessionals, pews, two choir stalls, the organ case and the stone sculptures on the church’s west front. Aside from the church furniture, the thesis furthermore handles the altarpieces of the aforementioned altars, painted by Leopold Keckheisen. Additionally, the thesis mentions the leather wallpapers preserved in situ on the walls of two of the altars, as well as the stone cavalry in the immediate vicinity of the church. The thesis concludes with a review of the specific Pauline iconography, of the Pauline saints, their symbols, and the way they are represented, as well as a review of the copy of the icon Mother of God from Częstochowa which, according to some sources, “cried” at the beginning of the 18th century.