Santa Barbara church was built in 1757 for the Convent of the Salesas Reales, housing nuns belonging to the order of St. Francis de Sales. The convent was founded in 1748 by the Queen Bárbara de Braganza, wife of Ferdinand VI of Spain. The church, which stood next to the convent, was designed by Francisco Carlier in collaboration with Francisco Moradillo. In 1870, the monastery was closed, and the government used the monastery as the Palace of Justice, now as the Supreme Court. In 1891, the church was open to parish worship.
The exterior is noted for the statues of St. Francis de Sales and St Jeanne de Chantal, founders of the Order, sculpted by Alfonso Giraldo Vergaz. In the interior, are the burial tombs of Ferdinand VI and his wife. These were commissioned by Charles III of Spain and completed by the architect Francisco Sabatini and the sculptor Francisco Gutiérrez.
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.