Mongol conquest of Anatolia
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Through Mongols and Successor state
By the end of the 14th century, most of Anatolia was controlled by various beyliks due to the collapse of the Seljuk dynasty in Rum. The Turkmen beyliks were under the control of the Mongols through the 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 Ottoman ruler Osman I was the first Turkish ruler who minted coins in his own name in the 1320s. Since the minting of coins was a prerogative accorded in Islamic practice only to be a sovereign, it can be considered that the Ottomans became independent of the Mongol Khans.
Early relations
In the 12th century, the Byzantine Empire reasserted 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 close to the Mongol Empire. Control of Anatolia was then split between the Greek states and the Seljuk Sultanate of Rum, with the Byzantine holdings gradually being reduced.
The Mongol Empire conquered Persia in 1230, and Chormaqan became its military governor. There were then no hostilities with the Seljuk Turks. Kayqubad I and his immediate successor Kaykhusraw II swore an oath of vassalage with the payment of at least token tribute to the Great Khan Ögedei. Ögedei died in 1241, and Kaykhusraw took the opportunity to repudiate his vassalage, believing he was strong enough to resist the Mongols. Chormaqan's successor Baiju summoned him to renew his submission: 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, vassal of the Mongol Empire.
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Fall of Erzurum
Baiju's army attacked Erzurum in relation to Kaykhusraw's disobedience in 1241. Before attacking, Baiju demanded submission. The inhabitants of the city insulted the Mongol envoy sent by him. Since the city decided to resist and defied Mongol diplomacy, the Mongols besieged it. In two months, the Mongols took Karin and punished its residents. Aware of the Seljuk power in Anatolia, Baiju returned to the Mugan plain without advancing further.
Campaign in Erzurum
Baiju advanced to Erzurum with a contingent of Georgian and Armenian warriors under Avag and Shanshe in 1243. They besieged the city of Erzurum when its governor Yakut refused to surrender it. With the power of twelve catapults, Baiju stormed Erzurum. When the reports of the attack on Erzurum reported to him, Kaykhusraw II 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.
Köse Dağ
The Seljuk Sultan made an alliance with all the nations surrounding him. The King of 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 320 kilometres (200 miles) up to Köse Dağ. The Mongol 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 Arzenjan (Erzincan), Divriği 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 Mongol Khagan 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 Mongol 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.