Oria Cathedral (Basilica di Santa Maria Assunta) is the episcopal seat of the Diocese of Oria. In 1750 the then bishop of Oria demolished the 13th-century Romanesque cathedral that stood previously on the site, which had been left unsafe by the earthquake of February 20, 1743. Two columns from the old church were purchased for 8000 ducats for use in the Capella Reggia of Caserta.
The new church was reconsecrated in 1756. The façade includes a clock tower to the left and a campanile to the right. The dome is covered with polychrome tiles. The interior is richly decorated. The interior of the church has a crypt with niches containing mummified bodies.
In 1992, Pope John Paul II granted the cathedral the status of a minor basilica.
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.