Early Christian Basilica of St. Mary Formosa is part of the Benedictine Abbey Assembly, erected in the second half of the 6th c. thanks to the Archbishop Maximian of Ravine, originally from Istria.

The three-nave basilica has two side chapels adjacent to the shrine, the south of which has been preserved to this day, and the north has been largely incorporated into adjacent apartment buildings.

The north wall of the basilica is today visible as the fence wall of the adjacent garden, in which place was probably the Benedictine Abbey.

After a series of adversities and severe damage in the war of Pula with Venice in 1243, the basilica was in a dilapidated state at the end of the 16th century. From P. Kandler's description we learn that in 1847, apart from the preserved chapels, parts of the apse and perimeter walls are still visible.