The term 'Khan of Note' is a reference to the Mongolian ruler Genghis Khan, who was one of the most powerful and influential leaders in history. The crossword solution for this term is 'AGA', which is an acronym for 'Abu Ghraib Army', a term used to describe the Mongolian army under Genghis Khan's rule. Genghis Khan was known for his military prowess and his ability to conquer vast territories, making him one of the most renowned rulers in history.