Heir and Great Khan
Before the invasion of the Khwarazmian empire, Genghis Khan's wife Yesui urged him to name an heir. His two eldest sons, Jochi and Chagatai, quarrelled bitterly over the question, and Ögedei was chosen as a compromise acceptable to both. Jochi died shortly before his father, and when Genghis Khan died in 1227 his youngest son, Tolui, acted as regent.
In 1229 a kurultai, the assembly of princes and commanders that decided successions and planned campaigns, met to confirm the choice. Since Genghis Khan's wishes were clear, the outcome was never in doubt. After ritually refusing three times, Ögedei was enthroned as Great Khan in September 1229. Like his father, he conducted his wars through generals in the field, who acted on their own judgement but answered to him, and his orders travelled by a relay system that reached almost every part of Asia.
Karakorum
An empire of this size needed a fixed centre where revenue could be gathered and stored and where a central government could work. In 1235 Ögedei had a walled capital built at Karakorum, in the Orkhon Valley of central Mongolia, west of modern Ulaanbaatar. It was not a large city, but it was the first Mongol capital; Kublai's later capitals, Shangdu (Xanadu) and Dadu, replaced it.
Ögedei kept a palace at Karakorum and visited it, but spent much of the year moving between seasonal camps in the traditional way. The city depended on food brought in from outside, yet it became the empire's main storehouse and supply centre. Its position on the Silk Roads drew merchants, who were also attracted by the generous prices Ögedei paid for their goods, and Buddhists, Daoists, Muslims and Christians all built places of worship there. The famous silver fountain of Karakorum, which served different drinks from spouts in the form of lions and snakes, was made later, for Möngke Khan.
Roads, Relay Stations and Wells
Ögedei extended the Yam, the Mongol relay system, across the whole empire, with stations at regular intervals that supplied horses, food and lodging. Messengers carried a tablet of authority, a kind of passport, that set out what each station had to provide. He also had wells dug across the dry steppe so that merchants and troops had a regular supply of water on their journeys.
Taxation and Government
The conquest of northern China raised the question of what to do with a vast farming population. Ögedei's Khitan adviser Yelü Chucai argued that it would yield far more as a source of regular taxes than as plunder or pasture, and a census of north China was carried out between 1234 and 1236. The census and its distribution of households were handled by officials called jarguchi, who had begun as judges overseeing the division of the spoils of war and became administrators in the new government.
Members of the imperial bodyguard and court ministers were sent out as regional governors to supervise the local officials who collected taxes, supported by branch offices that combined officials with heads of the imperial clan. The system worked, though in time it led to abuses. With revenue secured and the administration in order, Ögedei turned to new conquests.