The Monastery of Koutloumousiou is one of twenty monasteries on the Mount Athos peninsula and is located on the northeastern side of the peninsula, near Karyes. It is sixth in hierarchical rank among the monasteries.
While the existence of the monastery is confirmed by document from 1169, Koutloumousiou Monastery was founded in its present form in the 14th century. Its central church was built in 1540. It is considered to be one of the most magnificent of all the monasteries of Mount Athos.
The central church was built in 1540, but there are many chapels associated with the monastery. The most impressive of these is the chapel of the Protection of the Mother of God, built in 1733, which is at the left of the eso-narthex of the central church and contains a wonderworking icon of the Mother of God holding Christ as a child. Other chapels include St. Natalia, Ss. Kosmas and Damian, All Saints, St. John the Baptist, the Archangels and St. Spyridon.
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.