The Château de Roquessels was built in the 10th century. It was a dependency of the convent of Cassans, which collected tithes from the baron of Margon. In 1247, the inhabitants of the village, like all subjects of the Trencavels, viscount of Béziers, were released from their pledge of allegiance and submitted to the King of France. The castle resisted valiantly the assaults of Simon de Montfort's army. Today, the only remains are a chapel with fine windows and massive walls on three sides.
The castle was abandoned for more comfortable dwellings in the 18th century, in line with the changing tastes of the aristocracy of the period. The keep was destroyed during the French Revolution and its stones used to build the new mairie (town hall).
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.