The Sainte-Croix church of Oloron-Sainte-Marie was built from 1080, at the same time as the city of Sainte-Croix was established. Served by canons of the Augustinian order, the church was a parish until the 14th century. It was transformed for a time into a Protestant temple from 1569 to 1621.
Architecturally, the plan is made up of a nave and two side aisles ending in a choir extended by a cul-de-four apse. The north portal is from the Romanesque period, and is decorated with carved capitals. On the other hand, the side portal built in the 19th century was removed in the 20th century to restore the church to its original appearance.
One of the distinctive features of the church is its ribbed dome of Byzantine and Mozarabic inspiration which covers the crossing of the transept. Inside, barrel or semi-barrel vaults are also typical of Romanesque art, like the many capitals with plant motifs or evoking biblical themes.
In the 19th century, large frescoes representing the 'Passion of Christ' and the 'Last Judgment' were painted, particularly in the choir. There is also a pulpit and stalls from the beginning of the 18th century as well as the altar and its altarpiece in the Spanish Baroque style, dating from the same period (1708).
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.