Biligtü Khan, born Ayushiridara , was the Mongol of the Yuan Dynasty in Mongolia.
He was born to and Khatun. He became crown prince but it caused an internal strife between his supporters and opponents. An opposition leader Bolud Temür occupied the capital in 1364. Ayushiridara fled to K&, a warlord. Köke Temür overthrer Bolud Temür in the next year.
In 1368 the Yuan Dynasty was expelled from China by the new Ming Dynasty. In 1370 his father Toghun Temür Khan died in Yingchang and Ayushiridara succeeded to the throne. Shortly after the succession, he fled to Karakorum and he changed the era name to Xuanguang there.
The Yuan Dynasty still remained a powerful empire. In 1372 Köke Temür won a victory over Ming in northern Mongolia. The victory in 1372 was not overwhelming. Ming's central army won a series of victories to arrive at the north of Ulan Bator and was finally defeated due to extended supply line. Ming's west army won a series of overwhelming victories. Ming's east army won a series of victories, but suffered comparable damage of Yuan. Ayushiridara died in 1378 and succeeded to the throne.