The Raya or frontier between the kingdoms of Castile and Aragón was fortified with a system of castles and walled-cities that were useful during the several conflicts that took place in the late Middle Ages. The Serón de Nágima castle defended the communication road between the axis of the Jalón river valley, which flows into the Ebro, and Duero valley. Its uniqueness stems from the fact that it is one of the few fortifications in the area where rammed earth is the only building system used. In this paper, the castle building fundaments are exposed mainly focusing on the techniques and building processes developed from the interpretation of the legible constructive signs in its walls.
The late medieval strategy for delimitating and defending the frontier between Castile and Aragón was in its systematic fortification. Ancient castles and Muslim fortifications were repaired and new buildings for defense were erected. The aim of the author's Doctoral Thesis, which gathers from the present paper, is to know the construction techniques of a selection of these castles, so as to interpret the building activity of that historical moment and analyze the systematization of these construction techniques within the historical, geographical and architectural context.The research method consists of a fieldwork in which a series of castles are documented and surveyed; they are previously selected after analyzing the bibliographical works of the medieval Soria's castellology.
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.