Ferdinand III tasked the Knights of the Order of Santiago with reinforcing the land forces of the amphibious siege on Seville, so the territory around Montemolín including Segura was conquered by the knights towards 1246–1248 as part of the operations to clean up the rearguard in Sierra Morena. Paio Peres Correia, Master of the Order of Santiago, granted Segura a "fuero" (copied from that of Sepúlveda) on 26 March 1274, thus Segura segregated from the "encomienda" of Montemolín and became a standalone town.