When a schooltextbooktellsusthatGenghisKhaninyear X orAlexanderinyear Y, haveeachconqueredhalfoftheworld, itmeansonlythatitissosaidinsomeofthewrittensources.
Have a freshoutlookoneverythingsaidorprintedabout "ancient" and "enigmatic" Roman, GreekandEgyptian, medievalaswellasallother "lostandfound" civilizations.