Here is a cool link for history buffs: To Rule the Earth… It lists the largest empires based on the total land area they controlled/ruled. The British Empire is #1 of course “the sun never sets on the British Empire”.
The Islamic/Calphate empire comes in at 7th. This is a good and fair in my opinion. I’ve seen history books that ignore the Islamic empire power and abilities.
They miss the Purgatorian Empire, but that is yet to come.
some of them do not consider the vast islamic empire as one empire , but till the abbasite Calphate , all islamic land were governed by 1 calphate , it started going down when they took control