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Hun Huns attila china han rome roman empire catalaunian plains aetius mobei eastern roman empire roman history western roman empire fall of rome attila the hun fall of the roman empire atilla the hun the huns genghis khan sack of rome hunnic empire ancient rome byzantine empire history channel ottoman empire kings and generals julius caesar tengri mongols genghis ancient history crash course seljuks ottoman white huns Hephthalites king and general