Castellar de la Frontera is a village within a castle surrounded by the walls of a well preserved Moorish-Christian fortress. It is located within the Parque Natural de Los Alcornocales next to a reservoir formed by the Guadarranque River.
The history of the village goes back to prehistoric times and the Bronze Age, after which the place became a medieval fortress. The prehistoric presence is still evident in the many caves around the area, where enthusiasts can see the wonderful cave drawings as proof of its heritage. It played an important role in the wars between the Spanish and the Muslims. In such a high up advantageous strategic position, peoples of many cultures wanted to control this strong vantage point.
The village was conquered and won back between Fernando III, the Moors and then Juan II, who described it as 'such a wonderful, strong town'. After the many battles of medieval times, by October 1650 Teresa María Arias de Saavedra, the Countess of Castellar, took possession of the town and later it was in the hands of the Medinaceli family.
The village was abandoned in the 1970s and its inhabitants moved to the aptly named Nuevo Castellar. The derelict state of the village attracted a number of Germans who took over the empty houses and built temporary dwellings outside the walls. The village was later repopulated.
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.