of 1206 and reforms manuscript. The , a banner fashioned from the tails of
yaks or horses, is placed on the right; the white pictured here represent peace, while a black would represent war.|alt=Illustration of a crowned man on a throne, surrounded by retainers. Now sole ruler of the steppe, Temüjin held a large assembly called a at the source of the Onon River in 1206. Here, he formally adopted the title "Genghis Khan", the etymology and meaning of which have been much debated. Some commentators hold that the title had no meaning, simply representing Temüjin's eschewal of the traditional title, which had been accorded to Jamukha and was thus of lesser worth. Another theory suggests that the word "Genghis" bears connotations of strength, firmness, hardness, or righteousness. A third hypothesis proposes that the title is related to the
Turkic ('ocean'), the title "Genghis Khan" would mean "master of the ocean", and as the ocean was believed to surround the earth, the title thus ultimately implied "Universal Ruler". Genghis Khan then began a "social revolution", in May's words. As traditional tribal systems had primarily evolved to benefit small clans and families, they were unsuitable as the foundations for larger states and had been the downfall of previous steppe confederations. Genghis thus began a series of administrative reforms designed to suppress the power of tribal affiliations and to replace them with unconditional loyalty to the khan and the ruling family. As most of the traditional tribal leaders had been killed during his rise to power, Genghis was able to reconstruct the Mongol social hierarchy in his favour. The highest tier was occupied solely by his and his brothers' families, who became known as the ( 'Golden Family') or ( 'white bone'); underneath them came the ( 'black bone'; sometimes ), composed of the surviving pre-empire aristocracy and the most important of the new families. To break any concept of tribal loyalty, Mongol society was reorganised into a military decimal system. Every man between the age of fifteen and seventy was conscripted into a ( ), a unit of a thousand soldiers, which was further subdivided into units of hundreds (, ) and tens (, ). The units also encompassed each man's household, meaning that each military was supported by a of households in what May has termed "a
military–industrial complex". Each operated as both a political and social unit, while the warriors of defeated tribes were dispersed to different to make it difficult for them to rebel as a single body. This was intended to ensure the disappearance of old tribal identities, replacing them with loyalty to the "Great Mongol State", and to commanders who had gained their rank through merit and loyalty to the khan. This particular reform proved extremely effective—even after the
division of the Mongol Empire, fragmentation never happened along tribal lines. Instead, the descendants of Genghis continued to reign unchallenged, in some cases until as late as the 1700s, and even powerful non-imperial dynasts such as
Timur and
Edigu were compelled to rule from behind a puppet ruler of his lineage. Genghis's senior were appointed to the highest ranks and received the greatest honours. Bo'orchu and
Muqali were each given ten thousand men to lead as commanders of the right and left wings of the army respectively. The other were each given commands of one of the ninety-five . In a display of Genghis' meritocratic ideals, many of these men were born to low social status: Ratchnevsky cited Jelme and Subutai, the sons of blacksmiths, in addition to a carpenter, a shepherd, and even the two herdsmen who had warned Temüjin of Toghrul's plans in 1203. As a special privilege, Genghis allowed certain loyal commanders to retain the tribal identities of their units. Alaqush of the Ongud was allowed to retain five thousand warriors of his tribe because his son had entered into an alliance pact with Genghis, marrying his daughter Alaqa. A key tool which underpinned these reforms was the expansion of the ('bodyguard'). After Temüjin defeated Toghrul in 1203, he had appropriated this Kereit institution in a minor form, but at the 1206 its numbers were greatly expanded, from 1,150 to 10,000 men. The was not only the khan's bodyguard, but his household staff, a military academy, and the centre of governmental administration. All the warriors in this elite corps were brothers or sons of military commanders and were essentially hostages. The members of the nevertheless received special privileges and direct access to the khan, whom they served and who in return evaluated their capabilities and their potential to govern or command. Commanders such as Subutai,
Chormaqan, and
Baiju all started out in the , before being given command of their own force.
Consolidation of power (1206–1210) From 1204 to 1209, Genghis Khan was predominantly focused on consolidating and maintaining his new nation. He faced a challenge from the
shaman Kokechu, whose father Münglig had been allowed to marry Hö'elün after he defected to Temüjin. Kokechu, who had proclaimed Temüjin as Genghis Khan and taken the
Tengrist title "Teb Tenggeri" ( "Wholly Heavenly") on account of his sorcery, was very influential among the Mongol commoners and sought to divide the imperial family. Genghis's brother Qasar was the first of Kokechu's targets—always distrusted by his brother, Qasar was humiliated and almost imprisoned on false charges before Hö'elün intervened by publicly reprimanding Genghis. Nevertheless, Kokechu's power steadily increased, and he publicly shamed Temüge, Genghis's youngest brother, when he attempted to intervene. Börte saw that Kokechu was a threat to Genghis's power and warned her husband, who still superstitiously revered the shaman but now recognised the political threat he posed. Genghis allowed Temüge to arrange Kokechu's death, and then usurped the shaman's position as the Mongols' highest spiritual authority. During these years, the Mongols imposed their control on surrounding areas. Genghis dispatched Jochi northwards in 1207 to subjugate the , a collection of tribes on the edge of the
Siberian taiga. Having secured a marriage alliance with the
Oirats and defeated the
Yenisei Kyrgyz, he took control of the region's trade in grain and furs, as well as its
gold mines. Mongol armies also rode westwards, defeating the Naiman-Merkit alliance on the
River Irtysh in late 1208. Their khan was killed and Kuchlug fled into
Central Asia. Led by
Barchuk, the
Uyghurs freed themselves from the suzerainty of the
Qara Khitai and pledged themselves to Genghis in 1211 as the first
sedentary society to submit to the Mongols. The Mongols had started raiding the border settlements of the
Tangut-led
Western Xia kingdom in 1205, ostensibly in retaliation for allowing Senggum, Toghrul's son, refuge. More prosaic explanations include rejuvenating the depleted Mongol economy with an influx of fresh goods and
livestock, or simply subjugating a semi-hostile state to protect the nascent Mongol nation. Most Xia troops were stationed along the southern and eastern borders of the kingdom to guard against attacks from the
Song and
Jin dynasties respectively, while its northern border relied only on the
Gobi desert for protection. After a raid in 1207 sacked the Xia fortress of
Wulahai, Genghis decided to personally lead
a full-scale invasion in 1209. Wulahai was captured again in May and the Mongols advanced on the capital Zhongxing (modern-day
Yinchuan) but suffered a reverse against a Xia army. After a two-month stalemate, Genghis broke the deadlock with a
feigned retreat; the Xia forces were deceived out of their defensive positions and overpowered. Although Zhongxing was now mostly undefended, the Mongols lacked any
siege equipment better than crude
battering rams and were unable to progress the siege. The Xia requested aid from the Jin, but
Emperor Zhangzong rejected the plea. Genghis's attempt to redirect the
Yellow River into the city with a dam initially worked, but the poorly constructed
earthworks broke—possibly breached by the Xia—in January 1210 and the Mongol camp was flooded, forcing them to retreat. A peace treaty was soon formalised: the Xia emperor
Xiangzong submitted and handed over tribute, including his daughter Chaka, in exchange for the Mongol withdrawal.
Campaign against the Jin (1211–1215) Wanyan Yongji usurped the Jin throne in 1209. He had previously served on the steppe frontier and Genghis greatly disliked him. When asked to submit and pay the annual tribute to Yongji in 1210, Genghis instead mocked the emperor, spat, and rode away from the Jin envoy—a challenge that meant war. Despite the possibility of being outnumbered eight-to-one by 600,000 Jin soldiers, Genghis had prepared to invade the Jin since learning in 1206 that the state was wracked by internal instabilities. Genghis had two aims: to take vengeance for past wrongs committed by the Jin, foremost among which was the death of
Ambaghai Khan in the mid-12th century, and to win the vast amounts of plunder his troops and vassals expected. After calling for a in March 1211, Genghis launched
his invasion of Jin China in May, reaching the
outer ring of Jin defences the following month. These
border fortifications were guarded by Alaqush's Ongud, who allowed the Mongols to pass without difficulty. The three-pronged
chevauchée aimed both to plunder and burn a vast area of Jin territory to deprive them of supplies and popular legitimacy, and to secure the
mountain passes which allowed access to the
North China Plain. The Jin lost numerous towns and were hindered by a series of defections, the most prominent of which led directly to Muqali's victory at the
Battle of Huan'erzhui in autumn 1211. The campaign was halted in 1212 when Genghis was wounded by an arrow during the unsuccessful siege of Xijing (modern
Datong). Following this failure, Genghis set up a corps of
siege engineers, which recruited 500 Jin experts over the next two years. The defences of
Juyong Pass had been strongly reinforced by the time the conflict resumed in 1213, but a Mongol detachment led by Jebe managed to infiltrate the pass and surprise the elite Jin defenders, opening the road to the Jin capital
Zhongdu (modern-day
Beijing). The Jin administration began to disintegrate: after the
Khitans, a tribe subject to the Jin, entered open rebellion, Hushahu, the commander of the forces at Xijing, abandoned his post and staged a coup in Zhongdu, killing Yongji and installing his own puppet ruler,
Xuanzong. This governmental breakdown was fortunate for Genghis's forces; emboldened by their victories, they had seriously overreached and lost the initiative. Unable to do more than camp before Zhongdu's
fortifications while his army suffered from an epidemic and famine—they resorted to
cannibalism according to
Carpini, who may have been exaggerating—Genghis opened peace negotiations despite his commanders' militance. He secured tribute, including 3,000 horses, 500 slaves, a Jin princess, and massive amounts of gold and silk, before lifting the siege and setting off homewards in May 1214. As the northern Jin lands had been ravaged by plague and war, Xuanzong moved the capital and
imperial court southwards to
Kaifeng. Interpreting this as an attempt to regroup in the south and then restart the war, Genghis concluded the terms of the peace treaty had been broken. He immediately prepared to return and capture Zhongdu. According to Christopher Atwood, it was only at this juncture that Genghis decided to fully conquer northern China. Muqali captured numerous towns in
Liaodong during winter 1214–1215, and although the inhabitants of Zhongdu surrendered to Genghis on 31 May 1215, the city was sacked. When Genghis returned to Mongolia in early 1216, Muqali was left in command in China. He waged a brutal but effective campaign against the unstable Jin regime until his death in 1223. ==Later reign: western expansion and return to China (1216–1227)==