The parish church of Ják is the most complete Romanesque Church in Hungary. It was founded around 1220 and consecrated in honor of St. George in 1256. It was originally built as the church of a Benedictine monastery.
During the construction phase, the plans may have been changed several times, as shown by various irregularities. It has a troubled history: damaged by fire, storm, and the Ottoman army, it had to be restored several times.
Its most famous feature is the main entrance, which is recessed inward and has several sections, decorated with Norman motifs, and above which Jesus is depicted in the tympanum with angels and apostles. Opposite the main facade of the church, there is a small chapel. This is the Chapel of St. James, which in the Middle Ages was the church of Jac since the monastery church was not allowed to function as a parish church.
The rotunda has been built with 4 apses and 2 floors.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.