The Mongolian Rite of the Templar Order was one of the autonomous factions of the Templar Order. Founded under Möngke Khan, the branch comprised many of the elite members of the Mongol Empire including the imperial guard of the Keshigs.
It was responsible for the apparent destruction of the Levantine Brotherhood of Assassins, toppling key bases such as Alamut and Masyaf, though in reality the Brotherhood had merely feigned defeat to disband across the globe.
Following the Battle of Legnica in 1241, a captured Templar knight was brought to the court of the Mongol prince Möngke. The young soldier taught the Templar ideals to Möngke and recruited the Mongol warlord into the Order. Some years later, Möngke inducted at least one of his children, Asutai, into the Order.
In 1251, Möngke became the Great Khan of the Mongol Empire thanks to a prong of the Trident of Eden which was in his possession. Under Möngke's rule, the imperial guard, the Keshigs, were also for the most part recruited into the Templar Order.
Under Möngke Khan, the Mongols continued the expansion of the empire. Determined to exterminate the Levantine Brotherhood of Assassins, Möngke sent armies to assault their base of Alamut in Persia and their citadels among the An-Nusayriyah Mountains in 1257. That year, Masyaf fell to the Mongols, and the order seemed to have been finally destroyed. In truth, the Assassins had merely disbanded to extend their organization across the world.
Within a week of the Fall of Masyaf, the Mongols ambushed Niccolò and Maffeo Polo, the Venetian merchants entrusted to the Assassins' legacy by the Mentor Altaïr Ibn-La'Ahad. Though they failed to kill them, they managed to seize Altaïr's Codex, containing invaluable information for the Assassin Brotherhood and take it back to Mongolia, where it would eventually fall into the hands of Möngke's successor, Kublai Khan.
During that period, Möngke Khan personally led an invasion of China, a continuation of his father's ambition. Despite his precipitous success, his advance was suddenly stopped at Diaoyu Fortress in 1259 by the Song army, thanks in part to the sacrifice of a Chinese Assassin. Later that year, while Möngke's forces were still camped outside the stronghold, the Great Khan was assassinated by the Assassin apprentice Zhang Zhi, the daughter of the Assassin responsible for his prior defeat.