The Fort de Valros is a ruined small castle or fortress. The site has no visible trace of occupation from antiquity, but archaeological digs have uncovered the remains of a necropolis used from the 8th to the 10th century.
The promontory on which the fort stands is a strategic observation post. It dominates the valley of the Thongue and controls two very ancient communication routes: the roads from Béziers to Pézenas and from Saint-Thibéry to Alignan-du-Vent. From historical records, it is known that in 1199, the powerful Viscount of Béziers, Raymond Roger Trencavel, authorised his vassal Etienne de Servian to build a forcia on the podium of Valros. But, from 1210, during the Albigensian Crusade, Etienne de Servian was forced to recount, under pressure from the troops of Simon de Montfort. Thus, the fortress had only a short functioning military life. It was dismantled soon after its construction, in the first half of the 13th century. Thereafter, the site continued to be frequented by troops who took water from the cistern, which never dried up.
The small square tower nestled in the south west corner of the fortress is a remnant of the aerial telegraphy invented at the end of the 18th century by the engineer Claude Chappe (1763-1805), using semaphore signals.
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.