The Peribleptos Monastery is a late Byzantine-era monastery in Mystras, Greece. It was probably built in the mid-14th century by the first Despot of the Morea, Manuel Kantakouzenos, and named after one of the most celebrated monasteries of Byzantine Constantinople. The Monastery is built into the side of a cliff with a cave supporting the structure. This architectural style is known as the Mystras style and is prevalent in several churches and monasteries in the area, this style is typified by a resemblance to a castle. It is constructed of squared stones with inlaid tiles. The complexity and unique variations of the shape of the structure of the exterior create an interior surface inside the monastery that lends itself to the ethereal quality of the frescoes covering the walls.
The frescos in the main church, dating between 1348 and 1380, are a very rare surviving late Byzantine cycle, are crucial for the understanding of Byzantine art. These works have been connected with the Cretan and Macedonian art schools.
The relics include a fresco of Saint John the Baptist in a scene of The Baptism of Christ. Another notable relic is the head of Saint Gregory of Nazianzus, 4th-century Archbishop of Constantinople.
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.