This was a system devised by Martín Enríquez de Almanza following the strategy that had been developing in Spain throughout the Reconquista period. Therefore, in order to protect the Camino de la Plata, which stretched between Zacatecas and Mexico City, three presidios fortifications founded by the Indian fighter Juan Domínguez, were to be created, which were: the presidio at Las Bocas, later called Las Bocas de Gallardo, situated on the border of Aguascalientes, in what was the jurisdiction of the mayor of Teocaltiche, presently the border of Aguascalientes and Zacatecas; the presidio at Palmillas, which was located near what is now Tepezalá; and the Ciénega Grande presidio, established around 1570. The latter was located on what are now Moctezuma and Victoria Streets, although some historians place it on the Calle 5 de Mayo (once the Camino Real) at Moctezuma, just in front of the Plaza de Armas. This was a fortress whose purpose was the protection of the Valle de los Romero and the road to Zacatecas, entering this way to secure the passage of convoys loaded with silver and other metals.