Saint-Lizier Cathedral can refer to either of the two former co-cathedrals of the town of Saint-Lizier, Notre-Dame Cathedral (Cathédrale Notre-Dame-de-la-Sède de Saint-Lizier) and St. Lizier's Cathedral (Cathédrale Saint-Lizier de Saint-Lizier), dedicated to Saint Lycerius.
Saint-Lizier falls into two quite separate parts, each with its own cathedral. The lower part contains the old village around the Cathedral of Saint Lizier while the upper part, surrounded by ancient fortifications, includes the Bishop's Palace.
St. Lizier's Cathedral features an octagonal tower and attractive cloisters with a balcony and interesting carved stone decorations at the top of the columns. There are a large number of ancient (11th century) frescoes inside the cathedral.
The cathedral is part of the UNESCO World Heritage Site of Routes of Santiago de Compostela.
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.