Eauze former cathedral is a national monument. It was the ecclesiastical seat of the former Diocese of Eauze, which was merged into the Bishopric of Auch, probably in the 9th century. Eauze Cathedral is dedicated to Saint Luperculus, who is said to have been a bishop here in the 3rd century before being martyred.
Odon, Count of Fezensac, founded a Benedictine monastery on this site After 960 AD. In 1088, the monastery was united with the abbey of Cluny and become then a priory. This status remained until the French Revolution. There exact time of construction of churches prior to the current church is unknown.
The construction of the present church was ordered by Jean Marre, who had became a prior of Eauze in 1463. The church had to be built on the site of a previous church, probably with three naves, which would explain the narrow width of the nave compared to its height (21.5 m at highest). The monument underwent a major restoration between 1860 and 1878.
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.