1157, Castile. The Kingdoms of Spain are in a perpetual fight for existence against Muslim invasion. The recently captured fortress Calatrava struggles to maintain a garrison to withstand the Moors. The Templars have failed to hold back the onslaught and the situation is dire. King Alfonso VII seeks volunteers in his war against the Muslims. A simple monk, Father Diego, proposes that the Cisternian brothers defend the castle as soldiers of the cross. Thus the very same year, the Order of Calatrava is born. Following a series of successful campaigns during the Reconquista, the Order of Calatrava etched their name permanently in the history of Christendom with their exploits.