Its population at the time has been estimated as between 110 and 150 million (a quarter of the world's population), over a territory of more than 4 million square kilometres (1.2 million square miles).
Populasinya pada masa ikut diperkirakan antara 110 an 150 juta (seperempat populasi dunia), pada wilayah lebih dari 3.2 juta kilometer persegi (1.2 juta mil persegi).