Greek Catholic Co-cathedral of Saints Cyril and Methodius is located in the Street of St. Cyril and Methodius on the Upper Town in Zagreb.
Greek Catholic church and seminary (built in 1681) existed on the Upper Town before the 17th century. This Church was intended for the Greek Catholic believers, mostly people from Žumberak Mountains, Uskoks and clerics that lived in and around Zagreb. It is not possible to determine when was this Church built because a fire that broke out in 1766 destroyed most of the Church's books that would give a precise date.
The current church dedicated to St. Cyril and Methodius was built in 1886 during the reign of Bishop Ilija Hranilović on the site of the former church of St. Basil. The parish uses the facilities of the Greek Catholic seminary that is connected to the Church which gives room that serves as a parish office, and, since 1932, a hall with sacristy.
Co-Cathedral was designed by Hermann Bollé. It is built in the neo-Byzantine style of historicism. Co-Cathedral owns a rich collection of paintings by Ivan Tišov, as well as icons by E.A. Bučevski and professor Nikola Mašić. There are three bells in the 50m high Co-Cathedral's belfry. Largest bell weights 782 kg and is dedicated to St. Cyril and Methodius, medium bell that weight 395 kg is dedicated to the Mother of God and small bell that weights 230 kg and is dedicated to Basil of Ostrog. Co-Cathedral owns a precious cross for tetrapod, reliquary, and two capes, as well as set of kit icon mounted on wood for the cross.
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.