The Berke–Hulagu war was fought between two Mongol leaders, Berke Khan of the Golden Horde and Hulagu Khan of the Ilkhanate. It was fought mostly in the Caucasus mountains area in the 1260s after the destruction of Baghdad in 1258. The war overlaps with the Toluid Civil War in the Mongol Empire between two members of the Tolui family line, Kublai Khan and Ariq Böke, who both claimed the title of Great Khan (Khagan). Kublai allied with Hulagu, while Ariq Böke sided with Berke. Hulagu headed to Mongolia for the election of a new Khagan to succeed Möngke Khan, but the loss of the Battle of Ain Jalut to the Mamluks forced him to withdraw back to the Middle East. The Mamluk victory emboldened Berke to invade the Ilkhanate. The Berke–Hulagu war and the Toluid Civil War as well as the subsequent Kaidu–Kublai war marked a key moment in the fragmentation of the Mongol empire after the death of Möngke, the fourth Great Khan of the Mongol Empire.

In 1252, Berke converted to Islam, and in 1257 he assumed power in the Golden Horde after the death of Ulaghchi. Like his brother Batu, he was loyal to the Great Khan Möngke. Although aware of Berke's conversion to Islam, Hulagu, after conquering Persia, destroyed Baghdad in 1258, added Mesopotamia to the Mongol Empire, advanced towards the Levant and Mamluk Sultanate, and began a war of attrition against the Mamluk Sultanate. Berke became enraged with Hulagu's rampage through Muslim lands, and as a preparatory step, directed his nephew Nogai Khan to raid Poland in 1259 in order to collect booty to finance a war. Several Polish cities were plundered, including Kraków and Sandomierz. Berke then struck an alliance with the Mamluk Sultan Qutuz and later Sultan Baibars of Egypt.
In 1260, Hulagu's lieutenants in the Middle East lost the Battle of Ain Jalut to the Mamluks while Hulagu was in Mongolia to participate in the succession of a new Great Khan following the death of Mongke. Upon hearing the news, Hulagu began preparing to avenge the defeat. Two years later he returned to his lands in Persia, but was distracted and prevented from dealing with the Mamluks when Berke carried through on the threat to war against his cousin so as to avenge the sack of Baghdad. Berke again unleashed Nogai Khan to launch a series of raids – this time multiple reconnaissances in force in the Caucasus region – which drew Hulagu north with the bulk of his forces. Berke also dispatched Negudar to eastern Afghanistan and Ghazni, recovering lands under Il Khanate control.

Hulagu was loyal to his brother Kublai, but clashes with their cousin Berke, the ruler of the Golden Horde in the northwestern part of the Empire, began in 1262. The suspicious deaths of Jochid princes in Hulagu's service, unequal distribution of war booties and Hulagu's massacres of the Muslims increased the anger of Berke, who considered supporting a rebellion of the Georgian Kingdom against Hulagu's rule in 1259–1260.Berke also forged an alliance with the Egyptian Mamluks against Hulagu, and supported Kublai's rival claimant, Ariqboke.

Kublai dispatched an army under Abaqa to attack the Golden Horde, while Ariqboke sent Nogai to invade the Ilkhanate; both sides suffered disastrous defeats. Hulagu marched northwards through the pass of Derbend against Berke. On the banks of the Terek, he was ambushed by an army of the Golden Horde under Nogai, and his army was defeated at the Battle of the Terek River (1262), with many thousands being cut down or drowning when the ice of the river gave way. Hulagu subsequently retreated back into Azerbaijan.

Arikboqe surrendered to Kublai at Shangdu on August 21, 1264, after which the rulers of the Golden Horde and Chagatai Khanate acknowledged the reality of Kublai's victory and rule, after which Kublai began preparations for his conquest of the Song dynasty.
When the Byzantine Empire, the ally of the Ilkhanate, captured Egyptian envoys, Berke sent an army through his vassal Bulgaria, prompting the release of the envoys and the Seljuq Sultan Kaykaus II. He tried to raise civil unrest in Anatolia using Kaykawus but failed. In the new official version of the family history, Kublai Khan refused to write Berke's name as the khan of Golden Horde for his support to Arikboke and wars with Hulagu, however, Jochi's family was fully recognized as legitimate family members.

Kublai Khan also reinforced Hulagu with 30,000 young Mongols in order to stabilize the political crises in western khanates.[10] As soon as Hulagu died on 8 February 1265, Berke marched to cross near Tiflis, but he died on the way. Within a few months of these deaths, Alghu Khan of the Chagatai Khanate died too. Nevertheless, this sudden vacuum of power relieved Kublai's control over the western khanates somewhat.

This was the second open war between Mongols, shortly after the beginning of the Toluid Civil War between Kublai Khan and Ariq Böke
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