Fortress and Frontier at the End of the Middle Age: The Example of the Kingdom of Murcia (Spain)

Taking as example some of the most important castles of Santiago Military Order in the Kingdom of Murcia, there will be analysed the function of the fortress in the configuration of the defence of the Christian Kingdoms against Islam in the Low Middle Age. For that purpose, there would be studied the texts of the 15th century that describe this kind of installations and the archaeological information.