After his accession, Oghul Qaimish was implicated in a failed coup attempt by Naqu—in retaliation to her refusal to submit, Möngke had her imprisoned, allegedly tortured and, after a show trial, executed.
The precise year of Oghul Qaimish's birth is unknown: the historian Anne Broadbridge estimates, based on the approximate date of her marriage, that she was born in the early 1200s.
[7] As a member of a divided tribe who brought few political connections to the marriage, Oghul Qaimish was a poor strategic match for Güyük: Broadbridge speculates that Töregene may have purposefully overlooked more reputable brides because of her own Merkit heritage.
[13] At the suggestion of Batu and Ögedei's influential sister-in-law Sorghaghtani Beki, Oghul Qaimish took the position of regent with the support of Qadaq, Güyük's former tutor, and the officials Chinqai and Bala.
[15] Unlike Töregene, Oghul Qaimish was not confident in politics—she had no obvious political objectives, generally neglected the administration of the empire, and reportedly spent much of her time consorting with shamans.
[24] As regent of the empire, Oghul Qaimish could theoretically have drawn upon far greater resources than the other plotters, but her cash flow was extremely strained because she was unable to effectively collect taxes.
[27] Möngke intercepted and defeated the would-be ambushers and demanded that Oghul Qaimish submit to him publicly; upon her refusal, she was arrested and brought to the camp of Sorghaghtani, who was now terminally ill.[28] There, she was stripped naked, and allegedly tortured by being whipped with burning sticks of wood.
After a show trial, Möngke's chief judge found Oghul Qaimish guilty of witchcraft and sentenced her to execution: she was wrapped in felt and cast into the Kherlen river to drown.