Khan of Heaven
Khan of Heaven or Tian Kehan, Celestial Kha(ga)n, Heavenly Kha(ga)n, Tengri Kha(ga)n (Chinese: 天可汗; pinyin: Tiān Kèhán; Wade–Giles: T'ien K'ehan; Old Turkic: 𐱅𐰭𐰼𐰃𐰴𐰍𐰣) was a title addressed to the Emperor Taizong of Tang by various Turkic nomads. It was first mentioned in accounts on May 20, 630 and again on October 24, 646, shortly after the Eastern Turkic Khaganate and Xueyantuo were annihilated by the Tang dynasty.