Calabria was part of the Byzantine Empire until the 11th century. A Greek monk, St. John Theristus, operated in the Stilaro Valley during the 9th century. His aghiasma ('holy font') became a popular center of local pilgrimage, and here a Byzantine monastery was founded in the 11th century. After the Norman conquest of southern Italy, it developed as one of the most important Basilian monasteries in southern Italy, maintaining its splendour until the 15th century, with a rich library and numerous art treasures.
It lived a phase of decline until 1579, when the founding of the Basilian Order of Italy restored it as the main Basilian center in southern Calabria. However, in the 17th century brigandage damaged the monastery, and the monks decided to moved to a bigger monastery outside the walls of Stilo, carrying with them the relics of the namesake saint. In the early 19th century, after the Napoleonic conquest of the Kingdom of the Two Sicilies, it was acquired by the comune of Bivongi, who sold it to private owners. In 1980 it was sold back to the municipal authority and, in the 1990s, restored to the Italian Basilian Order. In 2001, the Patriarch of Constantinople Bartholomew I visited the monastery and returned here the saint's relic from Stilo.
In July 2008, the city council of Bivongi has granted the use of the church for 99 years to the newly formed Romanian Orthodox Church in Italy.
The edifice is an example of transition between the Byzantine and Norman styles in architecture in southern Italy. Norman elements include the four corner pilasters closed by four arches, which support the dome, two of them being ogival.
Clearly Byzantine is the exterior, in particular in the external walls, in the fake columns of the apse, which forms ogival arches, and in the 16 small columns decorating the dome's tambour. The interior also houses traces of Byzantine frescoes, such as that portraying St. John Theristis.
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.