The quriltai: Chinggis Khan proclaimed
1206
At a great quriltai on the Onon River, Temüjin took the title Chinggis Khan and founded the Yeke Mongghol Ulus. The state spanned ~4M km².
1218–1227
At the 1206 quriltai on the Onon, Temüjin was acclaimed Chinggis Khan and the Great Mongol State was born. Decimal organization that broke tribal lines, the Ikh Zasag legal tradition, the örtöö relay network, religious tolerance and promotion by merit carried it from ~4M to ~20M km² within half a century, history's largest contiguous land empire. In 1995 The Washington Post named Chinggis Khan its 'Man of the Millennium', the «Мянганы суут» legacy of a world he connected.
1218 is Jebe's conquest of Qara Khitai, the first move west; 1227 is the death of Chinggis Khan. The Tangut (1209) and Jin (1211) wars were expansion too, and it went on to 1279. This row tells the western campaign of Chinggis Khan's own lifetime.
Death tolls are contested: the famous 40–60 million figure traces to a single criticized source (McEvedy & Jones 1978), and scholars treat medieval chroniclers' numbers as exaggerated (Morgan, May). This site shows ranges only.
This period has a page and its sources; the scroll-through chapter is not written yet.
1206
At a great quriltai on the Onon River, Temüjin took the title Chinggis Khan and founded the Yeke Mongghol Ulus. The state spanned ~4M km².
1206 · the sources disagree about this
Army and society were reorganized into tens–hundreds–thousands–tümens across tribal lines, with the khishigten guard at the core. From 1204 the Uyghur script served the Mongolian chancery (Tata-tonga); the Chinggis Stone (c. 1224–25, now in the Hermitage) is the oldest surviving monument of the Mongolian script.
Whether the Ikh Zasag was a fixed written code is disputed (Morgan 1986); treat it as an evolving legal tradition.
1206 · the sources disagree about this
With the great rewards of 1206 Chinggis Khan appointed 95 mingghan commanders (Secret History §202) and honored his companions led by Bo'orchu and Muqali (§§205–206), granting some the privilege of nine unpunished offenses (§§205–219). From this grew the famous list of nine örlög: the 'four hounds' Jebe, Qubilai, Jelme, Sübe'etei (§195) and the 'four steeds' Bo'orchu, Muqali, Boroqul, Chila'un among them.
No fixed 'nine örlög' office appears in the primary sources; the list of nine varies by tradition (Shigi Qutuqu, Naya'a, etc.). The great Mongolian dictionary glosses the phrase as 'those pardoned nine times.'
1209–1210
After the third campaign the Tangut (Xi Xia) state submitted; the final 1226–27 campaign destroyed it.
1211–1215
The war on the Jurchen Jin began; Zhongdu (Beijing) fell in 1215. ~5M km² by 1215.
1219–1221 · the sources disagree about this
After his envoys were murdered, Chinggis Khan marched west: Otrar besieged (1219), Bukhara and Samarkand fell (1220), Urgench (1221). ~11M km² by 1222.
May dates the campaign's start to 1218 (the westward march); we use 1219–1221 for the fighting in Khwarazm proper.
1220–1223
The ~20,000 men sent to hunt Shah Muhammad swept through northern Persia, Azerbaijan, Georgia (1221) and the Caucasus, beat the Alans and Kipchaks on the North Caucasus steppe, and in 1223 crushed a Rus'–Cuman coalition at the Kalka River (in today's eastern Ukraine): one of the longest cavalry raids in medieval history.
1227
Chinggis Khan died during the final Tangut campaign (August 1227). The empire spanned ~13.5 ± 1.5M km².
1235
Chinggis Khan fixed the site of Karakorum as a base in 1220; Ögödei walled it and built its palace in 1235, making it the capital, and regularized the örtöö (jam) relay network across the empire (1234–35): the communications spine of the largest contiguous state on earth. The stone turtles at Kharkhorin still mark that capital today.
1235–1242
Batu and Sübe'etei took Volga Bulgaria (1236), Ryazan (1237), Vladimir (1238) and Kiev (1240), then won at Legnica and Mohi within days (April 1241). The withdrawal of 1242 is conventionally put down to news of Ögödei's death.
1253–1258
Sent by Möngke, Hülegü marched west from 1253, crossed the Amu Darya (1256) and took the Nizari (Assassin) fortresses at Alamut, reaching Baghdad in 1258: the assault began January 29, the caliph surrendered February 10, the city was pillaged for a week and the caliph executed February 20: the Abbasid caliphate ended.
1260
Möngke died besieging Diaoyu Castle (1259) with no declared successor. In 1260 Kublai was proclaimed at Kaiping and Ariq Böke at Karakorum: the Toluid Civil War (1260–64). The same year, the Mamluks halted the Mongol advance at Ayn Jalut.