In compliance with the wishes of Chinggis, as expressed presumably in his legal code, the yasaq, his vast empire had been apportioned among his sons (only three survived; the eldest, Jochi, had died in 1227), and his sons' descendants, subject to the overall authority of the khan at Karakorum, which is rebuilt in 1235 by Ogedei.

Jochi's son, Batu, rules the region to the north and the west of Lake Balkash.

Chagatai, the second son of Chinggis, is given the southwestern region that includes modern Afghanistan, Turkestan, and central Siberia.

He and his successors will be known as the khans of the Chagatai Mongols.

By implication, this realm extends indefinitely to the southwest, as Batu's does to the northwest.

Ögedei and his progeny are awarded China and the other lands of East Asia.

Tolui, the youngest of the four principal heirs, was to have central Mongolia, the homeland, in accordance with Mongol custom.

He and his descendants, however, are to share Mongolia's precious fighting manpower with the other three khanates.

Central Asia (1108 – 1251 CE): Khwarazmian Rise, Karakhanid Decline, and Mongol Conquest

Geographic and Environmental Context

Central Asia includes the Syr Darya and Amu Darya basins (Transoxiana), Khwarazm, the Ferghana Valley, the Merv oasis and Kopet Dag piedmont, the Kazakh steppe to the Aral–Caspian lowlands, and the Tian Shan–Pamir margins.

• The oasis belts of Bukhara, Samarkand, Khwarazm (Urgench), and Merv anchored dense settlement and irrigation systems.

• The Kazakh steppe supported nomadic confederations of Kipchaks and later Mongols.

• The Tian Shan and Pamir mountains framed caravan routes linking the Tarim Basin with Transoxiana.

Climate and Environmental Shifts

• The Medieval Warm Period favored pastoral productivity on the steppe and sustained agriculture in irrigated oases.

• Variability in river flow from the Amu Darya and Syr Darya affected irrigation, requiring constant maintenance.

• Pastoralists and oasis farmers relied on exchange to balance environmental uncertainty.

Societies and Political Developments

• Karakhanids (10th–12th centuries): Fragmented into western and eastern branches; power waned after the early 12th century.

• Khwārazm-Shahs: Rose from Seljuk-appointed governors to powerful rulers. By the early 13th century, the Anushteginid dynasty expanded Khwarazm into an empire spanning Transoxiana, Khurasan, and Iran.

• Seljuks: Still influential in Persia and Khurasan early in this period, but their authority in Central Asia eroded.

• Kara-Khitai (Western Liao, 1124–1218): A Khitan successor state from Manchuria, they dominated much of Central Asia until overthrown by Khwarazm and Mongols.

• Mongol Conquest: From 1219–1221, Chinggis Khan’s armies devastated Central Asia, sacking Bukhara, Samarkand, Merv, and Nishapur, toppling the Khwarazm-Shahs. By 1251, Central Asia was reorganized under Mongol rule as part of the empire’s Chagatai Ulus.

Economy and Trade

• Oasis agriculture: wheat, barley, cotton, fruits, and melons formed the basis of settled economies.

• Pastoral economies of Kipchak and other steppe nomads supplied horses, livestock, and military manpower.

• Silk Road trade flourished: caravans carried silks, spices, ceramics, and precious metals between China, Persia, and the Mediterranean.

• Khwarazm’s position at the Oxus delta made it a commercial hub for east-west and north-south trade.

• The Mongol invasions disrupted but later reorganized Silk Road networks under imperial oversight.

Subsistence and Technology

• Qanats and irrigation canals sustained oasis farming; cotton production expanded.

• Brick and glazed tile architecture flourished in mosques, madrasas, and caravanserais.

• Seljuk and Khwarazmian military relied on cavalry, bows, and heavy armor, while Mongols introduced highly disciplined cavalry organization.

• Nomads used felt tents (yurts), portable and adapted to steppe life.

Movement and Interaction Corridors

• The Silk Road through Samarkand, Bukhara, and Kashgar remained the key east-west artery.

• Steppe corridors linked Kipchak and Mongol nomads with Eastern Europe, Persia, and China.

• The Oxus and Syr Darya valleys integrated highland, steppe, and desert zones.

• Pilgrimage and intellectual networks tied Central Asia to Khurasan, Persia, and the Islamic world.

Belief and Symbolism

• Islam (Sunni, Hanafi) was the dominant religion in the oases, supported by mosques, madrasas, and Sufi orders (Yasawiyya, Kubrawiyya).

• Sufism spread widely, with shrines and saints reinforcing Islam in both urban and rural areas.

• Steppe nomads practiced shamanistic traditions, though Islam spread gradually among Kipchaks.

• Mongol rulers at first remained shamanists, but tolerated diverse religions in their conquered territories.

Adaptation and Resilience

• Agricultural and pastoral symbiosis created resilience in the face of climatic fluctuation.

• Trade wealth underpinned Khwarazmian prosperity but also made oases vulnerable to invasion.

• Religious institutions and Sufi orders preserved community identity during political upheavals.

• The Mongol conquest devastated cities but later re-established order under imperial trade systems.

Long-Term Significance

By 1251 CE, Central Asia had been reshaped by the rise and fall of Khwarazm and the Mongol conquest. Once a hub of flourishing Islamic culture and Silk Road commerce, the region was now integrated into the Mongol Empire, under the Chagatai Ulus. The blending of Islamic scholarship, nomadic traditions, and imperial reorganization made Central Asia pivotal to Eurasian connectivity in the 13th century.

The death of Güyük in 1248 had probably averted an impending family war.

His widow and regent, Ogul-Gaimish, attempts to hold power for Ögödei’s sons and his brother Chaghatai, but the 1251 election goes to Möngke, son of Ghengis Khan’s youngest son Tolui.

The Ögödei princes conspire against Möngke, who has most of them executed, then orders Ogul-Gaimish wrapped in a carpet and cast in a river to drown.