The Monastery of Saint Dominic of Silos (the Old) (Monasterio de Santo Domingo de Silos el Antiguo) is a Cistercian monastery in Toledo. It was first founded in the 6th century and rebuilt in 1085 by Pedro Alcocer during the reign of Alfonso VI of Leon and Castille.
It underwent major rebuilding work in the second half of the 16th century, in which the mudéjar church was demolished. The new building was begun by Nicolás de Vergara and completed by the royal architect Juan de Herrera, as well as being provided with a new altarpiece by El Greco.
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.