Khagan or
Qagan (,
Khaan,
Mongolian Script: ,
Qaγan; or ; ,
Khāqān, alternatively spelled
Kağan,
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.