sentences:  The Franks (Western Europeans and those in the Crusader States of the Levant) were open to the idea of support from the East, in part owing to the long-running legend of the mythical Prester John, an Eastern king in an Eastern kingdom who many believed would one day come to the assistance of the Crusaders in the Holy Land.The Franks and Mongols also shared a common enemy in the Muslims.However, despite many messages, gifts, and emissaries over the course of several decades, the often-proposed alliance never came to fruition.