Zadar is one of the oldest cities on the eastern coast of the Adriatic Sea and an important historical and cultural center of northern Dalmatia. The city is located on a peninsula in the central part of the Croatian coast and is the administrative center of Zadar County.
Zadar has a long history, as it was already an important Roman city in antiquity. In different periods, the city was ruled by the Byzantines, the Venetians, and other authorities, which is also reflected in its architecture and cultural heritage. It is known for many historical landmarks, the Roman Forum, medieval churches, and unique modern installations such as the Sea Organ and Greeting to the Sun. Among the landmarks, the Church of St. Donatus stands out as one of the most recognizable buildings in Zadar and a symbol of the city. It is located in the historic center of the city, next to the remains of the Roman Forum. The church was built in the 9th century during the Early Middle Ages and represents one of the most important examples of pre-Romanesque architecture in Croatia and the wider Adriatic region. It was named after Donatus, the bishop of Zadar, who initiated its construction. Until the 15th century, it was known as the Church of the Holy Trinity. It was first mentioned in written sources in the mid-10th century. The church is particularly notable for its circular shape, which is quite unusual for church architecture. It was built with massive stone walls, and its central space has a cylindrical form above which rises a circular gallery. The building is approximately 27 meters high and about 22 meters in diameter. The interior of the church is divided into three circular sections supported by stone columns and arches. During the construction of the church, many stone elements from the nearby Roman Forum were also used, such as columns, capitals, and stone blocks. Because of this, the church still preserves an interesting connection between ancient and medieval architecture.
Today, the Church of St. Donatus is no longer used for regular religious services but mainly serves as a cultural monument and a venue for various cultural events. Due to its exceptional acoustics, concerts of classical and medieval music are often held there, as well as a music festival called Musical Evenings at St. Donatus.