“…Secondly, the low population density that is characteristic of these insecure border regions, the demographic decline brought about by epidemics, 11 and the expulsion of the Muslim population 10 Following the example of the Holy Land crusaders, the Castilians created three great military orders that served as armies for the country to conquer Muslim lands and defend the Christian frontier. The order of Calatrava was founded in 1158, the order of Santiago in 1170, and the order of Alcántara in 1175, during the second half of the twelfth century, a period from which military orders grew in importance due to their key role in the defense of the frontier (Forey, 1984;González Jiménez 1989), with the creation about a century later of the order of Santa María de España (1272). Besides their military activity, these orders played an active role in the resettlement of the conquered lands.…”