The Sigurata Church is located in the northwestern part of the Prijeko area, in the historic center of Dubrovnik, near the Franciscan monastery. Today it's part of the nunnery of the Franciscan school sisters. The name Sigurata comes from the Latin name for the Transfiguration of the Lord - Transfiguratio Domini.
It was a single nave edifice with a dome. The building was divided into three bays with semicircular vaults and an apse that is semicircular inside and rectangular on the outside. Today, the Church is a three-nave building as a result of the last major reconstruction that took place after the earthquake in 1667. Two aisles were added and connection with the side aisles was established by removing the walls between the girders in all three aisles.
Research in the 20th century identified two older phases of construction. The first points to the crossroads of late antiquity and the early Middle Ages (from the 6th to the 8th century), the second to the early Middle Ages (9th century), while the pre-Romanesque single-nave building with a dome probably dates from the 10th or the 11th century. The church changed after that, and it probably got three naves even before the great earthquake.
Fragments of fresco decoration probably date in the 14th century.
It recalls characteristics of the Churches of St. Peter in Omiš, St. Nicholas in Dubrovnik and St. Michael in Ston.