Santa María de Montederramo's origins seem to have been the old Church of San Juan, which grew into a monastery. It was founded as a Cistercian monastery by Doña Teresa, Alfonso VII´s daughter, in 1142, bringing French nuns from Claraval. Other writers refer to it as Cistercian in the year 1153, when it adopted the worship of St. Mary.
In the year 1528, it joined the Cistercian Congregation, in Spain, with the building´s reconstruction beginning at that time, including the church, with most of the work taking place during the 16th century. The slender church stands on a Latin-cross ground plan, with three aisles in five sections along the main arm; side arms marked on the ground floor, five rectangular chapels, the central the main one. The aisles have Ogival, ribbed vaults, with lunettes and coffering. In the transept, there is a dome over pendentives with cupola. The facade flay and austere. The church was begun in the year 1598, with Juan de Tolosa as master-architect, from the Company of Jesus, and creator of the Hospital of Medina del Campo, in addition to other builders. Construction work ended in the year 1607, inscreibed on the facade.
The monastery has two cloisters, the oldest of which is in evolved Ogival style, square, with five semi-circular arches per side and nine-pointed star-vaults; the upper part has Renaissance and Baroque arches and windows. The second cloister is square, elegant, with four semi-circular arches per side over free-standing Renaissance columns, and sculpted medallions and shields, all dating from the 16th century. It also has a large, monumental stairway down to the church and a fine sacristy.The regular or processional cloister is connected to the church. In the early 1980s this area was rescued from a state of ruin, and once restored it began to be used as a school.
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.