The church of Saint-Martin was first built between 1468 and 1472 on a site opposite the castle of Pau. In the 19th century, the church was too small for the population of Pau and was replaced in 1871 by a new church located a little further east. It was therefore decided to demolish the old church in 1885. The church tower was partially destroyed in 1794, then rebuilt in wood in 1805 before being completely rebuilt when the new Saint-Martin church was built. The new building is of neo-Gothic architecture with a Byzantine influence.
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.