Agde Cathedral is dedicated to Saint Stephen and stands on the bank of the Hérault River. The present building was constructed in the 12th century, beginning in 1173 under the direction of bishop William II of Agde, and replaced a Carolingian church of the 9th century that stood on the foundations of a 5th-century Roman church, formerly a temple of Diana.
The cathedral is remarkable for being built of black basalt from the nearby volcanic Mont St. Loup quarries. The building is extremely strong and was designed to serve as a fortress as much as a church: the walls are between 2 and 3 metres thick, and the square tower, 35 metres high, could also function as a keep, or donjon. The crenellations and machicolations are very prominent, and again, more characteristic of a fortress than of a church.
The Romanesque cloister which once adjoined the cathedral was demolished in 1857. Many of the materials, such as the capitals and the columns, were shortly afterwards reused for the construction of the lady chapel, which is now used as the entrance.
In the severe interior the 17th century high altar of polychromatic marble stands out all the more, as do the organs in Baroque style.
Of the cathedral's five bells, four are hung in the belltower, and were cast by Burdin-Aîné of Lyon in 1894 and 1895. The fifth is on top of the bellower and is used only for the chiming of the clock, cast in 1665 by Daniac Fulcrand at Béziers, and declared a monument historique in 1959.
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.