Great Khan in the context of "Northern Song dynasty"

The Song dynasty (/sʊŋ/ SUUNG) was a unifying imperial dynasty of China that ruled from 960 to 1279. The dynasty was founded by Emperor Taizu of Song, who usurped the throne of the Later Zhou dynasty and went on to conquer the rest of the Ten Kingdoms, ending the Five Dynasties and Ten Kingdoms period. The Song often came into conflict with the contemporaneous Liao, Western Xia and Jin dynasties in northern China. After retreating to southern China following attacks by the Jin dynasty, the Song was eventually conquered by the Mongol-led Yuan dynasty.

The dynasty's history is divided into two periods: during the Northern Song (北宋; 960–1127), the capital was in the northern city of Bianjing (now Kaifeng) and the dynasty controlled most of what is now East China. The Southern Song (南宋; 1127–1279) comprise the period following the loss of control over the northern half of Song territory to the Jurchen-led Jin dynasty in the Jin–Song wars. At that time, the Song court retreated south of the Yangtze and established its capital at Lin'an (now Hangzhou). Although the Song dynasty had lost control of the traditional Chinese heartlands around the Yellow River, the Southern Song Empire contained a large population and productive agricultural land, sustaining a robust economy. In 1234, the Jin dynasty was conquered by the Mongols, who took control of northern China, maintaining uneasy relations with the Southern Song. Möngke Khan, the fourth Great Khan of the Mongol Empire, died in 1259 while besieging the mountain castle Diaoyucheng in Chongqing. His younger brother Kublai Khan was proclaimed the new Great Khan and in 1271 founded the Yuan dynasty. After two decades of sporadic warfare, Kublai Khan's armies conquered the Song dynasty in 1279 after defeating the Southern Song in the Battle of Yamen, and reunited China under the Yuan dynasty.

Omurtag (or Omortag) (died 831) also known as Murtag or Murtagon (Bulgarian: Омуртаг; Greek: Μορτάγων and Ομουρτάγ) was a Great Khan (Kanasubigi) of Bulgaria from 814 to 831. He is known as "the Builder".

In the very beginning of his reign he signed a 30-year peace treaty with the neighboring Byzantine Empire which remained in force to the end of his life. Omurtag successfully coped with the aggressive policy of the Frankish Empire to take Bulgaria's north-western lands and suppressed the unrest among several Slavic tribes. He made administrative reforms which increased the power and the authority of the central government. His reign was marked with a strong development of Bulgarian architecture with a number of significant construction projects.

The Chagatai Khanate, also known as the Chagatai Ulus, was a Mongol and later Turkicized khanate that comprised the lands ruled by Chagatai Khan, second son of Genghis Khan, and his descendants and successors. With the division of the Mongol Empire after 1259, it became a functionally separate khanate. At its height in the late 13th century, the khanate extended from the Amu Darya south of the Aral Sea to the Altai Mountains on the border of modern-day Mongolia and China, roughly corresponding to the area once ruled by the Qara Khitai (Western Liao dynasty).

Initially, the rulers of the Chagatai Khanate recognized the supremacy of the Great Khan, but by the reign of Kublai Khan, Ghiyas-ud-din Baraq no longer obeyed the emperor's orders. From 1363, the Chagatais progressively lost Transoxiana to the Timurids. The reduced realm came to be known as Moghulistan, which lasted until the late 15th century, when it broke off into the Yarkent Khanate and Turpan Khanate. In 1680, the remaining Chagatai domains lost their independence to the Dzungar Khanate. Finally, the Kumul Khanate, an autonomous division of China established during the Qing dynasty in 1696 and governed by descendants of Chagatai Khan, was abolished during the Republic of China in 1930, ending the dynasty.

The Berke–Hulegu war was fought between two Mongol leaders, Berke Khan of the Golden Horde and Hulegu 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 Hulegu, while Ariq Böke sided with Berke. Hulegu 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–Hulegu 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 khan of the Mongol Empire.