Four Oirats

The Four Oirat ( Mongolian: Дөрвөн Ойрад, ''Dorben Oirad''; ); also Oirads and formerly Eleuths, alternatively known as the Alliance of the Four Oirat Tribes or the Oirat Confederation, was the confederation of the Oirat tribes which marked the rise of the Western Mongols in the history of the Mongolian Plateau.

Despite the universal currency of the term "Four Oirat" among Eastern Mongols, Oirats, and numerous explanations by historians, no consensus has been reached on the identity of the original four tribes. While it is believed that the term Four Oirats refers to the Choros, Torghut, Dorbet and Khoid tribes, there is a theory that the Oirats were not consanguineous units, but political-ethnic units composed of many patrilineages.

Background

The Oirats were one of the forest peoples who lived in west of the Mongols of Genghis Khan. They submitted to Genghis in 1207 and played prominent roles in the history of the Mongol Empire.

After the overthrow of the Yuan dynasty (1271–1368), Möngke-Temür, a high official of the Yuan, had placed himself at the head of the Oirats. When he died, three chieftains, Mahamu (Mahmud), Taiping and Batu-bolad, ruled them. They sent envoys with gifts to the Ming dynasty. In 1409, the Yongle Emperor (r. 1402–1424) bestowed upon them the title of wang in return. The Oirats began to challenge the Borjigin Emperors in the reign of Elbeg Khan (c. 1394–1399).

Before 1640, the Oirats had been wavering between the two faiths, Islam and Buddhism.

Apogee

The Chinese Yongle Emperor demanded Öljei Temür Khan Bunyashiri to accept his supremacy in 1409 but Öljei Temür refused and defeated a Ming force the next year. In 1412 a large force under Yongle forced Öljei Temür Khan to flee westward. The Oirats led by Mahamu of Choros killed Öljei Temür who suffered great loss.

The Western Mongols had Delbeg Khan—a descendant of Ariq Böke, whose family had been relegated to Mongolia during the Yuan—crowned. However, the Eastern Mongols under Arugtai of the Asud refused to accept the new khan and they were in constant war with each other. The Ming dynasty intervened aggressively against any overpowerful Mongol leader, exacerbating the Mongol-Oirat conflict.

In 1408 Mahamu was succeeded by his son Toghan, who continued his strife with Arugtai chingsang. By 1437, Toghan had totally defeated Arugtai and an Ögedeid Emperor Adai Khan. Toghan made Genghisid princes his puppet khans of the Mongolia-based Northern Yuan dynasty. When he died in 1438, his son Esen became a taishi. The Oirats had close relations with Moghulistan and Hami where the Chagatayid Khans reigned. From the Ming chronicles, it is known that the Oirats conducted regular raids on those areas. Esen crushed the Moghulistan and Hami monarchs and forced them to accept him as their overlord. He also conquered Outer