St. Martin's Church was built into a small space (an early guardhouse) within the ancient Golden Gate of Diocletian's northern wall. One of the oldest churchs in the city, Today St. Martin's Church is one of Split's tourist attractions and known for its fine 11th centery chancel screen. It is currently in the care of the Dominican sisters, who have a monastery next door. The church itself is open to the public to visit.
Church central area divided into two parts altar screen, made of marble and covered in vines, grape vines and griffon; on the space with an altar that was intended for the clergy and boat that was intended for laymen. On the altar wall of the altar, the only preserved in situ in Dalmatia, there is an inscription with the dedication of the Virgin Mary, St. Gregory the Pope and Blessed Martin.
The pre-Romanesque stage, probably built in the 9th century, belongs to the barrel vault, an altar in the apse with a carved cross of early Christian denominations and a small trance, set in the middle of large, buried antique openings on the southern wall. The later pre-Romanesque stage of the 11th century belongs to the altarpiece and the bell tower, which was later destroyed.
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.