Key Facts
- Active period
- 1399–1628
- Core tribes
- Choros, Torghut, Dörbet, Khoshut
- Region
- Western Mongolia / Mongolian Plateau
- Also known as
- Eleuths / Oirat Confederation
Imperial Zenith Metrics
Historical Trajectory
Phase I: Rise
The Four Oirats emerged as a distinct political confederation of Western Mongol tribes around 1399, filling the power vacuum left by the fragmentation of the Mongol Empire. Under early leaders such as Togoon Taishi and his son Esen Taishi, the Oirats consolidated tribal groupings — principally the Choros, Torghut, Dörbet, and Khoshut — and launched aggressive campaigns that extended their influence across the Mongolian Plateau and into Central Asia.
Phase II: Zenith
The confederation reached its height under Esen Taishi in the mid-15th century, when Oirat forces defeated and captured the Ming emperor Zhengtong at the Battle of Tumu in 1449. At this peak, the Four Oirats dominated trade routes across Central Asia, exerted tribute pressure on Ming China, and temporarily unified much of the steppe under Western Mongol leadership, outcompeting the Eastern Mongol successor states.
Phase III: Decline
After Esen's assassination in 1455, the confederation fragmented into competing tribal factions. Eastern Mongol resurgence under Dayan Khan further weakened Oirat unity through the late 15th and 16th centuries. By 1628 the original confederation had effectively dissolved, though its constituent tribes survived and regrouped; the Dzungar Khanate would later emerge as a successor power among the Western Mongols.
Notable Imperial Reigns
Selected rulers mapping the empire’s trajectory