Red Turban Rebellion
In 1307, Külüg Khan or the Emperor Wuzong of Yuan began the construction of Yuan Zhongdu () in Onggachatu (, north to present Zhangbei) where the court was moved. However, before full completion, Emperor Wuzong died soon and his successor Wuzong's brother, Emperor Renzong of Yuan called it off. In August 1329, during Tianli Incident following the War of the Two Capitals, the new emperor Khutughtu Khan Kusala was poisoned to death by El Temür in Zhongdu. Zhongdu was later destroyed in 1357 during the Red Turban Rebellion as the rebels marched towards Shangdu.