Artificial intelligent assistant

chagan

chagan Hist.
  (kaˈgɑːn)
  [ad. late L. chagānus, cagānus, in Byz. Gr. χαγᾶνος, ad. Old Turkish khāqān king, sovereign; see cham and khan.]
  An ancient form of the word khan; applied (after the mediæval Latin and Greek chroniclers) to the sovereign of the Avars in the 6th and 7th centuries.

1776–81 Gibbon Decl. & F. xlii. (1875) 719 The Avars..the chagan, the peculiar title of their king. Ibid. xlvi. (1875) 800 When the Roman envoys approached the presence of the chagan. 1842 Penny Cycl. XXIV. 73/2 The Khazars..their kings were called Chagan or more correctly Khaghan, which was the name of the old Mongol kings a thousand years before the appearance of the Khazars. Ibid. 74/2 The Russians in 1016..made their khaghan Georges Tzula a prisoner.

Oxford English Dictionary

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