And the irony of ironies: the Mongols later became Muslims and founded great Islamic Sultanates and Caliphates such as, the Ottomans and Mughals that shot up the prestige and power of Muslims, until their decline in the 19th Century.
The Mongol invasions helped European civilisation immensely. Before their onslaught and destruction, China and the Middle-east were well on the way to industrialization. Everyday, westerners must thank the Mongols and sacrifice at an altar dedicated to the Khans.
Ghazan was one of a long line of Mongol leaders who engaged in diplomatic communications with the Europeans and
Crusaders in attempts to form a Franco-Mongol alliance against their common enemy, primarily the Egyptian Mamluks. He already had the use of forces from Christian vassal countries such as The plan was to coordinate actions between Ghazan's forces, the Christian military orders, and the aristocracy of Cyprus to defeat the Egyptians, after which Jerusalem would be returned to the Europeans. Many Europeans are known to have worked for Ghazan, such as Isol the Pisan or Buscarello de Ghizolfi, often in high positions. Hundreds such Western adventurers entered into the service of Mongol rulers. According to historian Peter Jackson, the 14th century saw such a vogue of Mongol things in the West that many new-born children in Italy were named after Mongol rulers, including Ghazan: names such as
Can Grande ("Great Khan"),
Alaone (Hulagu, Ghazan's great-grandfather),
Argone (Arghun, Ghazan's father) or
Cassano (Ghazan) were recorded with a high frequency.
In October 1299, Ghazan marched with his forces towards Syria and invited the Christians to join him. His army took the city of Aleppo, and was there joined by his vassal King Hethum II of the Armenian Kingdom of Cilicia, whose forces included some Templars and Hospitallers, and who participated in the rest of the offensive. The Mongols and their allies defeated the Mamluks in the Battle of Wadi al-Khazandar, on December 23 or 24, 1299.One group of Mongols then split off from Ghazan's army and pursued the retreating Mamluk troops as far as Gaza, pushing them back to Egypt. The bulk of Ghazan's forces proceeded to Damascus, which surrendered somewhere between December 30, 1299, and January 6, 1300, though its Citadel resisted. Most of Ghazan's forces then retreated in February, probably because their horses needed fodder. He promised to return in the winter of 1300–1301 to attack Egypt. About 10,000 horsemen under the Mongol general Mulay were left to briefly rule Syria, before they too retreated.
Ghazan was indeed feared and despised by the Mamluks, who sent a delegation of leading scholars and imams including Ibn Taymiyya, north from Damascus to Al-Nabk, where Ghazan was encamped, in January, 1300, in order to persuade Ghazan to stop his attack on Damascus. Ibn Taymiyya also may have met Ghazan in Damascus in August 1301. On one of these occasions, it is reported that not one of the scholars dared to say anything to Ghazan except Ibn Taymiyya who said:
"You claim that you are Muslim and you have with you Mu'adhdhins, Muftis, Imams and Shaykhs but you invaded us and reached our country for what? Although your father and your grandfather, Hulagu were non-believers, they did not attack us and they kept their promise. But you promised and broke your promise."
In July 1300, the Crusaders formed a small fleet of sixteen galleys with some smaller vessels to raid the coast, and Ghazan's ambassador traveled with them. The Crusader forces also attempted to establish a base at the small island of Ruad, from which raids were launched on Tartus while awaiting Ghazan's forces. However, the Mongol army was delayed, and the Crusader forces retreated to Cyprus, leaving a garrison on Ruad which was besieged and captured by Mamluks by 1303.
In February 1301, the Mongols advanced again with a force of 60,000, but could do little else than engage in some raids around Syria. Ghazan's general Kutlushah stationed 20,000 horsemen in the Jordan Valley to protect Damascus, where a Mongol governor was stationed. But again, they were soon forced to withdraw.
Plans for combined operations with the Crusaders were again made for the following winter offensive, and in late 1301, Ghazan asked Pope Boniface VIII to send troops, priests, and peasants, in order to make the Holy Land a Frank state again. But again, Ghazan did not appear with his own troops. He wrote again to the Pope in 1302, and his ambassadors also visited the court of Charles II of Anjou, who on April 27, 1303 sent Gualterius de Lavendel as his own ambassador back to Ghazan's court.
In 1303, Ghazan sent another letter to Edward I via Buscarello de Ghizolfi , reiterating his great-grandfather Hulagu Khan's promise that the Mongols would give Jerusalem to the Franks in exchange for help against the Mamluks. The Mongols, along with their Armenian vassals, had mustered a force of about 80,000 to repel the raiders of the Chagatia Khanate, which was under the leadership of Qutlugh Khwaja. After their success there, they advanced again towards Syria. However, Ghazan's forces were utterly defeated by the Mamluks just south of Damascus at the decisive Battle of Marj al-Saffar in April 1303. It was to be the last major Mongol invasion of Syria.
The year 1303 saw the third Mongol invasion of Syria by Ghazan Khan. What has been called Ibn Taymiyyah's "most famous fatwa" was issued against the Mongols in the Mamluk's war.. Ibn Taymiyyah declared that jihad against the Mongol attack on the Malmuk sultanate was not only permissible, but obligatory. The reason being that the Mongols could not, in his opinion, be true Muslims despite the fact that they had converted to Sunni Islam because they ruled using what he considered 'man-made laws' (their traditional Yassa code) rather than Islamic law or Sharia, whilst believing that the Yassa code was better than the Sharia law. Because of this, he reasoned they were living in a state of jahiliyyah, or pre-Islamic pagan ignorance.
Ibn Taymiyyah called on the Muslims to Jihad once again and he also personally joined the eventual battle of Marj al-Saffar against the Mongol army. The battle began on 20 April of that year. On the same day, Ibn Taymiyyah declared a fatwa which exempted Mamluk soldiers from the fast during the month of Ramadan so that they could maintain their strength. Within two days the Mongols were severely defeated and the battle was won.