Mongol conquest of Anatolia
The Mongol conquest of Anatolia was achieved between 1241 and 1243. Real power over Anatolia was exercised by the Mongols after the Seljuks surrendered in 1243 until the fall of the Ilkhanate. Because the Seljuk Sultan rebelled several times, in 1255, the Mongols swept through central and eastern Anatolia, and would remain until 1335. The Ilkhanate garrison was stationed near Ankara. Remains of the Mongol cultural heritage still can be seen in Turkey, including tombs of a Mongol governor and a son of Hulagu.
By the end of the 14th century, most of Anatolia was controlled by various Anatolian beyliks due to the collapse of the Seljuk dynasty in Rum. The Turkmen Beyliks were under the control of the Mongols through declining Seljuk Sultans. The Beyliks did not mint coins in the names of their own leaders while they remained under the suzerainty of the Ilkhanids. The Osmanli ruler Osman I was the first Turkish ruler who minted coins in his own name in 1320's, for it bears the legend "Minted by Osman son of Ertugul". Since the minting of coins was a prerogative accorded in Islamic practice only to be a sovereign, it can be considered that Osmanli became independent of the Mongol Khans.
In the 12th century, the Byzantines managed to reassert their control in Western and Northern Anatolia. After the sack of Constantinople in 1204 by Latin Crusaders, two Byzantine successor states were established: the Empire of Nicaea, and the Despotate of Epirus. A third one, the Empire of Trebizond was created a few weeks before the sack of Constantinople by Alexios I of Trebizond. Of these three successor states, Trebizond and Nicaea stood near the Mongolian Empire. Control of Anatolia was then split between the Greek States and the Seljuk Sultanate of Rum, with the Byzantine holdings gradually being reduced.
During the Military governor Chormaqan's tenture in Persia, no hostilities occurred with the Seljuk Turks. 'Ala al-Din Kayqubad I and his immediate successor Giyath al-Din Kaykhusraw II swore an oath of vassalage with the payment of at least token tribute in the name of Ögedei Qaghan. However, the Mongols raided part of Greater Armenia which was under the Sultanate of Rum in 1238.
After the death of Ögedei in 1241, Kaykhusraw took the opportunity to terminate the tributary status of his realm, believing he was strong enough to resist the Mongol Empire. Chormaqan's successor Baiju summoned him to resubmit Asia Minor to its tributary status. The Sultan rejected his demands to make him go to Mongolia in person, give hostages, and accept a Mongol darughachi. When the Sultan refused, Baiju declared war. The Seljuks invaded the Kingdom of Georgia, part of the Mongol Empire.
Fall of Karin
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Baiju's army attacked Karin in relation to Kaykhusraw's disobedience in 1241. Before sacking of the city, Baiju demanded the submission of it. The inhabitants of the city bullied the Mongol envoy sent by him. Since the city decided to resist and defied the Mongol diplomacy, it is enclosed with the siege machines. In two months, the Mongols took it and punished its residents. Aware of the Seljuk power in Anaotlia, Baiju returned to Mughan plain without advancing further deep.
Campaign in Erzurum
Baiju advanced to Erzurum with a contingent of Georgian and Armenian warriors under Awag and Shansheh in 1243. They besieged the city of Erzurum when its governor Yakut refused to surrender it. With the power of twelve catapults and the bravery of the Mongols, Baiju stormed Erzurum. When the reports of the attack on Erzurum reported to him, Kaykhusraw summoned his armed forces at Konya. He accepted the challenge by sending a war message, defying Baiju that his army took only one of his many cities.
The Seljuk Sultan made an alliance with all nations surrounding him. The King of Lesser Armenia (Armenian Kingdom of Cilicia) promised him to send a contingent; however, it is not certain they really engaged in his struggle with the Mongols. Kaykhusraw received the military support from the Empire of Trebizond and the Ayyubid Sultan at Aleppo, and the Frankish mercenaries participated in the campaign. Because of little reliable information, it is difficult to measure the opposing troops. But the Seljuk force was larger than the Mongols.
Kaykhusraw advanced from Konya some 200 miles up to Köse Dağ. The Mongolian army entered the area in June 1243 and awaited the march of the Seljuks and their allies. The early stage of the battle was indecisive. The Sultan's forces suffered the greater casualties and he decided to withdraw at night. Pursuing him, Baiju received the submission of Erzinjan, Divrigi and Sivas en route.
The Mongols set up their camp near Sivas. When the Mongols penetrated into Kayseri, it chose to resist them. After a short resistance, it fell to the invaders. Hearing of the disaster at Köse Dağ, Hethum I of Armenian Kingdom of Cilicia quickly made his peace with the Mongols in 1243 and sent his brother Sembat to the Mongol court of Karakorum in 1247 to negotiate an alliance with the Mongolian Emperor Güyük.
Peace of Sivas
Kaykhusraw sent a delegation headed by his vizier to Baiju, realizing the further resistance would only produce a great disaster. Baiju offered terms based on resubmission and the Sultan was undertaken to pay a tribute tax every year in gold, silk, camel and sheep of uncertain quantities. However, the Turkish realm that had been taken by the military force remained occupied by the Mongols. Almost half of the Sultanate of Rum became an occupied country. The Empire of Trebizond became subject to the Mongolian Qaghan, fearing of the potential punitive expedition because they involved in the battle of Köse Dağ.
In the Empire of Nicaea John III Doukas Vatatzes prepared for the coming Mongol threat. However, Vatatzes had sent envoys to the Qaghans Güyük and Möngke but was playing for time. The Mongol Empire did not cause any harm to his plan to recapture Constantinople from the hands of the Latins who also sent their envoy to the Mongols. Vatatzes' successors, the Palaiologan emperors of the restored Byzantine Empire, made an alliance with the Mongols, giving their princesses in marriage to the Mongol khans.
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