The courts of Western Europe made many attempts to form an alliance with the Mongols, primarily with the Ilkhanate, in the 13th and 14th centuries, starting from around the time of the Seventh Crusade (West Europeans were collectively called Franks by Muslims and Asians in the era of the Crusades). United in their opposition to the Muslims (primarily the Mamluks), the Ilkhanate and the Europeans were nevertheless unable to satisfactorily combine their forces against their common enemy.