Biligtü Khan (Mongolian: Билэгт; Mongolian script: ᠪᠢᠯᠢᠭᠲᠦ; Chinese: 必里克圖汗) or the Emperor Zhaozong of Northern Yuan (Chinese: 北元昭宗), born Ayushiridara (Mongolian: Аюушридар ᠠᠶᠣᠱᠷᠢᠳᠠᠷ; Chinese: 愛猷識理達臘; Sanskrit: आयुष्य तल् means preservative of life), (23 January 1340 – April or May 1378) was an emperor of the Northern Yuan dynasty, reigning from 1370 to 1378. He ascended to the throne after the death of his father who was the last Yuan emperor. In 1372, he defeated an invading Ming army and recaptured some regions that were previously lost to the newly founded Ming dynasty.