The Church of St. Thomas is located 4 km north of Rovinj, along the old Rovinj-Kanfanar railway. It is a cruciform-shaped building, to which a bell tower was later added on the north side. The church's central apse is 6 meters high and semicircular, while its exterior is polygonal.
The transept has two smaller, semicircular lateral apses. On the north side of the church, we still find the original floor, covered with stone slabs, the base of the altar parapet, and the recesses on which the pillars rested. Looking up into the central space, we can still see the remains of the load-bearing arches that supported the structure, which rose above the roof.
In the 16th century, the church was radically renovated, altering its original form. Side arches were added, creating a single nave. The western side was visibly narrowed, and the new façade was equipped with two rectangular windows.
Recent research has uncovered numerous architectural artifacts dating back to the pre-Romanesque period and remains of furnishings—fragments of transennae, the pluteus, pillars from the altar parapet, columns with capitals, etc.
Based on the data we have, which are based on the architectural analysis of the church and the artifacts discovered during the research, we can establish that the building was constructed between the late 8th and early 9th centuries. The Church of St. Thomas is a fine example of sacred architecture from the Carolingian period in Istria.