The original castle in n a rocky spur was supposedly built in 413 by the Visigoths on the side of a mountain, defended by almost inaccessible cliffs. This fortress controlled the Arnette and the Thoré valleys, overlooking the plain where the town of Mazamet now stands.
Pierre-Raymond de Hautpoul is the first known lord of Hautpoul (mentioned in 1084). He rebuilt the castle, constructed the town walls and built the fortified church of Saint-Pierre d'Hautpoul. He accompanied his suzerain Raymond IV of Toulouse on the First Crude to the Holy Land in 1098.
In the 13th century, the lord of Hautpoul and Auxillan was Izarn d'Hautpoul. He reputedly adopted the Cathar faith. The castle and town was besieged by Simon de Montfort in 1212 during the Crusade against the Cathars of the Languedoc. The town was occupied and burned. Its fortifications were destroyed. However the survivors seem to have returned to Catharism as soon as the Crusaders left.
Around 1560, Huguenots (French Protestants) appeared in the region. The castle was besieged again during the wars of Religion between Catholics and Huguenots.
Today, you can still see the long village of Hautpoul winding down the hillside, along with the vestiges of upper and lower castles. At its foot, the river Arnette still winds, and its waters are still perfect for making wool. The old lower town gate has been restored, with its meurtrière. The village is being rejuvenated: picturesque old houses are occupied by craftsmen and their workshops.
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.