The knights of heaven are crusaders and christians and used their swords to fight against Islam. The Sword knights of the sky is in his knob, the cross formy with the legend of the knights templar Xpisti Sigillum Millitum. The crusades were a series of military campaigns commonly held by religious grounds conducted by much of Latin Europe as christian, in particular, of the franks of France and the Holy Roman Empire. The cross with the specific objective to re-establish control christian of the Holy Land were fought over a period of nearly 200 years, between 1095 and 1291.
Other campaigns in Spain and eastern Europe continued until the FIFTEENTH century. The crusades were held mainly against muslims, although several campaigns were made against the slavic pagans, jews, christians, orthodox greeks and russians, mongols, cathars, hussites, waldensians, prussians, and political enemies of the popes. The crusaders took vows and were granted penance for past sins, often called as indulgence.