Khagan or Qagan (Mongolian: хаан, Khaan, Mongolian Script: ᠬᠠᠭᠠᠨ, Qaγan; Chinese: 可汗; pinyin: Kèhán; Turkish: Kağan; Persian: خاقان, Khāqān, alternatively spelled Kagan, Khaghan, Kha-khan, Xagahn, Qaghan, Chagan, Қан, or Kha'an) is a title in the Mongolian language equal to the status of emperor and used to refer to someone who rules a khaganate or empire. The title was adopted by Ögedei Khan from the Turkic title kaɣan. The female equivalent is Khatun.
It may also be translated as Khan of Khans, equivalent to King of Kings. In modern Mongolian, the title became Khaan with the 'g' sound becoming almost silent or non-existent (i.e. a very light voiceless velar fricative); the ğ in modern Turkish Kağan is also silent. Since the division of the Mongol Empire, emperors of the Yuan dynasty held the title of Khagan and their successors in Mongolia continued to have the title. Kağan and Kaan are common Turkish names in Turkey.