You forgot to mention the Huns!!
Stats my not be recorded in the event of a WAR....the Mongol invasion and the Crusades were wars...and I think during a war all arrangement to keep record of the dead or alive gets upset as people are more worried to save their lives. They only guess the the number of dead from the number of remaining alive!
It's astonishing that still there is NO accurate record or data about population in some countries....which clearly reflects on planning but who cares?? Pakistan is such a country where I live....where all figures are sketchy and mostly guess work!! Pity If there is a war and people die one can only ascertain their true number through guess work!
On the contrary situation in developed country is different where every person is registered, but not so in some places![]()








