Sarno Cathedral is a Roman Catholic cathedral dedicated to Saint Michael in Sarno, a municipality in the province of Salerno. Formerly the seat of the Bishops of Sarno, since 1986 it has been a co-cathedral of the Diocese of Nocera Inferiore-Sarno.
There was a church on the site, dedicated to Saint Michael, from before 1066, when it became a cathedral. A new church was erected in 1620, although the presbytery was a century older. Today only the bell-tower retains Romanesque architectural elements in the windows and roof. After damage caused by the eruption of 1631, it was refurbished.
The church contains works by Angelo Solimena and his studio, including the ceiling paintings. The sacristy ceiling was also frescoed in the 18th century.
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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.