In which year Genghis Khan was proclaimed as Emperor or Khagan

By 1206 Temüüjin’s success in tribal warfare caused him to be proclaimed ruler of all the Mongols with the rank of khan and the title of Genghis (Chinggis)—a word deriving probably from the Turkic tengiz, meaning “ocean”; although this explanation has not convinced all Mongol scholars, it is consistent with the belief that the ocean symbolized breadth and depth of wisdom.